// Numbas version: finer_feedback_settings
{"name": "Ejercicio interactivo FIS2227 Semana 1", "metadata": {"description": "", "licence": "None specified"}, "duration": 0, "percentPass": 0, "showQuestionGroupNames": false, "shuffleQuestionGroups": false, "showstudentname": true, "question_groups": [{"name": "FIS2227_S1_Numbas", "pickingStrategy": "all-ordered", "pickQuestions": 1, "questionNames": ["", ""], "variable_overrides": [[], []], "questions": [{"name": "An\u00e1lisis cualitativo de la fuerza el\u00e9ctrica FIS2227", "extensions": [], "custom_part_types": [], "resources": [["question-resources/CoulombForce1.png.png", "/srv/numbas/media/question-resources/CoulombForce1.png.png"], ["question-resources/CoulombForce2.png.png", "/srv/numbas/media/question-resources/CoulombForce2.png.png"], ["question-resources/CoulombForce3.png.png", "/srv/numbas/media/question-resources/CoulombForce3.png.png"], ["question-resources/CoulombForce4.png.png", "/srv/numbas/media/question-resources/CoulombForce4.png.png"]], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "contributors": [{"name": "Jon Goss", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/3925/"}, {"name": "Marcelo Calder\u00f3n", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/17160/"}], "tags": ["coulomb", "elec", "field", "force", "mid1718"], "metadata": {"description": "<p>Conceptos y c&aacute;lculo en el contexto de la fuerza el&eacute;ctrica y campo el&eacute;ctrico. Incluyendo magnitudes de los vectores y sus unidades</p>", "licence": "None specified"}, "statement": "<p>Esta pregunta se enfoca en la comprensi&oacute;n de los nombres y unidades de aquellos s&iacute;mbolos relevantes en el contexto de la fuerza el&eacute;ctrica, la habilidad para realizar c&aacute;lculos de cantidades fisicas de la electrost&aacute;tica y evaluar las direcciones de las fuerzas involucradas. Todo esto con el bojetivo de reforzar el contenido necesario para el buen desempe&ntilde;o en el uso de las simulaciones correspondientes a la semana 1.</p>\n<p>Cuando proporcione respuestas num&eacute;ricas, puede expresarlas usando notaci&oacute;n cient&iacute;fica. Exprese los valores con cuatro cifras significativas y use los valores de las constantes f&iacute;sicas que se proporcionan en los PDF y videos del curso de Laboratorio y el te&oacute;rico.</p>", "advice": "<p>The Coulomb field is for a point charge (the equation does not generally apply to all charge arrangements):</p>\n<table>\n<tbody>\n<tr>\n<td>Symbol</td>\n<td>Description</td>\n<td>Units</td>\n</tr>\n<tr>\n<td>$E$</td>\n<td>Electric field strength</td>\n<td>V/m (or N/C)</td>\n</tr>\n<tr>\n<td>$q$</td>\n<td>Point charge</td>\n<td>C</td>\n</tr>\n<tr>\n<td>$\\varepsilon_0$</td>\n<td>Permittivity of free space</td>\n<td>F/m</td>\n</tr>\n<tr>\n<td>$\\varepsilon_r$</td>\n<td>Relative permittivity of medium betweem the point charge and where the field is being established</td>\n<td>none</td>\n</tr>\n<tr>\n<td>$r$</td>\n<td>Distance from the point charge - it's definitely not a radius!</td>\n<td>m</td>\n</tr>\n<tr>\n<td>$\\hat{r}$</td>\n<td>This is the unit radial vector.&nbsp; It is not a displacement (which would have units of m).</td>\n<td>none</td>\n</tr>\n</tbody>\n</table>\n<p>In the calculation of the magnitude of the electric field strength, care has to be taken to correctly account for units.</p>\n<p>From the electric field, a force can be obtained using $F=qE$.&nbsp; For this problem the field has already been obtained, and all that's required is to multiply this by the magnitude of the second point charge.</p>\n<p>Since the charges are opposite in sign, they attract.</p>", "rulesets": {}, "builtin_constants": {"e": true, "pi,\u03c0": true, "i": true}, "constants": [], "variables": {"q2": {"name": "q2", "group": "Ungrouped variables", "definition": "q2mu/10^6", "description": "<p>Second point charge in C.</p>", "templateType": "anything", "can_override": false}, "q1": {"name": "q1", "group": "Ungrouped variables", "definition": "q1mu/10^6", "description": "<p>Point charge in C.</p>", "templateType": "anything", "can_override": false}, "efield": {"name": "efield", "group": "Ungrouped variables", "definition": "q1/(4 pi eps0 r^2)", "description": "<p>Electric field at the distant point in N/C.</p>", "templateType": "anything", "can_override": false}, "q2mu": {"name": "q2mu", "group": "Ungrouped variables", "definition": "random(1..20 except q1mu*10)*-0.1", "description": "<p>Charge on the second point charge in muC.</p>", "templateType": "anything", "can_override": false}, "rmm": {"name": "rmm", "group": "Ungrouped variables", "definition": "random(1..20)*0.1", "description": "<p>Radial distance from the point charge, mm.</p>", "templateType": "anything", "can_override": false}, "r": {"name": "r", "group": "Ungrouped variables", "definition": "rmm/1000", "description": "<p>Radial distance from the point charge, m.</p>", "templateType": "anything", "can_override": false}, "force": {"name": "force", "group": "Ungrouped variables", "definition": "-efield*q2", "description": "<p>Magnitude of force on second point charge, N.</p>", "templateType": "anything", "can_override": false}, "eps0": {"name": "eps0", "group": "Ungrouped variables", "definition": "8.854*10^-12", "description": "<p>Permittivity of free space, F/m.</p>", "templateType": "anything", "can_override": false}, "q1mu": {"name": "q1mu", "group": "Ungrouped variables", "definition": "random(1..20 except rmm*10)*0.1", "description": "<p>Point charge in micro-C.</p>", "templateType": "anything", "can_override": false}}, "variablesTest": {"condition": "", "maxRuns": 100}, "ungrouped_variables": ["efield", "eps0", "force", "q1", "q1mu", "q2", "q2mu", "r", "rmm"], "variable_groups": [], "functions": {}, "preamble": {"js": "", "css": ""}, "parts": [{"type": "information", "useCustomName": false, "customName": "", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p>Como ya sabemos, la Ley de Coulomb puede ser expresada de la siguente manera. Se recomienda revisar los videos de las clases 1 y 2 de la semana 1 y sus respectivos PDF.</p>\n<p style=\"text-align: center;\">$\\displaystyle \\vec{E}= {q\\over 4 \\pi \\varepsilon_0 \\varepsilon_r r^2}\\hat{r}$.</p>"}, {"type": "gapfill", "useCustomName": true, "customName": "S\u00edmbolos, su significado y sus unidades de medida en el S.I.", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p style=\"text-align: center;\">$\\vec{E}$ es [[0]] con unidad de [[1]]</p>\n<p style=\"text-align: center;\">$q$ es [[2]] con unidad de [[3]]</p>\n<p style=\"text-align: center;\">$\\varepsilon_0$ es [[4]] con unidad de [[5]]</p>\n<p style=\"text-align: center;\">$\\varepsilon_r$ es [[6]] con unidad 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Ingrese el valor num&eacute;rico completo.</p>\n<p style=\"text-align: center;\">$|\\vec{E}|=$ [[0]]&nbsp;[[1]]</p>", "gaps": [{"type": "numberentry", "useCustomName": true, "customName": "E value", "marks": 1, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "minValue": "efield*0.995", "maxValue": "efield*1.005", "correctAnswerFraction": false, "allowFractions": false, "mustBeReduced": false, "mustBeReducedPC": 0, "precisionType": "sigfig", "precision": "4", "precisionPartialCredit": 0, "precisionMessage": "You have not given your answer to the correct precision.", "strictPrecision": false, "showPrecisionHint": false, "notationStyles": ["plain", "en", "si-en", "scientific"], "correctAnswerStyle": "plain"}, {"type": "1_n_2", "useCustomName": true, "customName": "units", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "minMarks": 0, "maxMarks": 0, "shuffleChoices": true, "displayType": "dropdownlist", "displayColumns": 0, "showCellAnswerState": true, "choices": ["N/C", "V/m", "A/m", "J/m", "C/s", "F/m"], "matrix": ["1", "1", 0, 0, 0, 0], "distractors": ["", "", "", "", "", ""]}], "sortAnswers": false}, {"type": "gapfill", "useCustomName": true, "customName": "Fuerza el\u00e9ctrica", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p>Cu&aacute;l es la ecuaci&oacute;n correcta para expresar la fuerza el&eacute;ctrica que una segunda carga, $q_2$ experimentar&iacute;a si es situada en un campo el&eacute;ctrico $E_1$, producido por la carga puntual del inciso anterior?</p>\n<p style=\"text-align: center;\">$F=$[[0]]</p>\n<p style=\"text-align: left;\">Ingrese sub &iacute;ndice <strong>b</strong> de una s&iacute;mbolo <strong>A</strong> como <strong>A_b</strong>.</p>", "gaps": [{"type": "jme", "useCustomName": true, "customName": "formula", "marks": 1, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "answer": "q_2 E_1", "showPreview": true, "checkingType": "absdiff", "checkingAccuracy": 0.001, "failureRate": 1, "vsetRangePoints": 5, "vsetRange": [0, 1], "checkVariableNames": true, "singleLetterVariables": true, "allowUnknownFunctions": true, "implicitFunctionComposition": false, "caseSensitive": false, "valuegenerators": [{"name": "e_1", "value": ""}, {"name": "q_2", "value": ""}]}], "sortAnswers": false}, {"type": "gapfill", "useCustomName": true, "customName": "Magnitud de la fuerza el\u00e9ctrica", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [{"variable": "efield", "part": "p2g0", "must_go_first": false}], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p>Calcule la magnitud de una fuerza que experimentar&iacute;a una carga puntual de {q2mu} &mu;C situada a {rmm} mm de distancia de otra carga puntual {q1mu} &mu;C en el vac&iacute;o.</p>\n<p style=\"text-align: center;\">$|\\vec{F}|=$ [[0]]&nbsp;[[1]]</p>", "gaps": [{"type": "numberentry", "useCustomName": true, "customName": "F Value", "marks": 1, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [{"variable": "efield", "part": "p2g0", "must_go_first": false}], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "minValue": "force*0.995", "maxValue": "force*1.005", "correctAnswerFraction": false, "allowFractions": false, "mustBeReduced": false, "mustBeReducedPC": 0, "precisionType": "sigfig", "precision": "4", "precisionPartialCredit": 0, "precisionMessage": "You have not given your answer to the correct precision.", "strictPrecision": false, "showPrecisionHint": false, "notationStyles": ["plain", "en", "si-en", "scientific"], "correctAnswerStyle": "plain"}, {"type": "1_n_2", "useCustomName": true, "customName": "units", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "minMarks": 0, "maxMarks": 0, "shuffleChoices": true, "displayType": "dropdownlist", "displayColumns": 0, "showCellAnswerState": true, "choices": ["N", "V", "A", "J", "C", "F"], "matrix": ["1", "0", 0, 0, 0, 0], "distractors": ["", "", "", "", "", ""]}], "sortAnswers": false}], "partsMode": "all", "maxMarks": 0, "objectives": [], "penalties": [], "objectiveVisibility": "always", "penaltyVisibility": "always", "type": "question"}, {"name": "An\u00e1lisis cuantitativo de la fuerza el\u00e9ctrica FIS2227", "extensions": [], "custom_part_types": [], "resources": [["question-resources/twopointcharges_0rTLjvT.png", "/srv/numbas/media/question-resources/twopointcharges_0rTLjvT.png"]], "navigation": {"allowregen": true, "showfrontpage": false, "preventleave": false, "typeendtoleave": false}, "contributors": [{"name": "Jon Goss", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/3925/"}, {"name": "Marcelo Calder\u00f3n", "profile_url": "https://numbas.mathcentre.ac.uk/accounts/profile/17160/"}], "tags": ["coulomb", "elec", "force", "tut1"], "metadata": {"description": "<p>Calculo simple de una fuerza de Coulomb entre dos cargas puntuales, enfocado en la importancia de las unidades de medida y la inclusi&oacute;n de las constantes correctas.</p>", "licence": "None specified"}, "statement": "<div><img src=\"resources/question-resources/twopointcharges_0rTLjvT.png\" style=\"display: block; margin-left: auto; margin-right: auto;\"/></div>\n<div></div>\n<div></div>\n<div>Esta pregunta se enfoca en el an&aacute;lisis de la Ley de Coulomb para la descripci&oacute;n cuantitativa de la Fuerza el&eacute;ctrica entre, para este caso, dos cargas puntuales estacionarias.</div>\n<div>Cuando proporcione respuestas num&eacute;ricas, puede expresarlas usando notaci&oacute;n cient&iacute;fica. Exprese los valores con cuatro cifras significativas y use los valores de las constantes f&iacute;sicas que se proporcionan en los PDF y videos del curso de Laboratorio y el te&oacute;rico. Consideraremos el valor de la permitividad relativa del aire como <img src=\"https://wikimedia.org/api/rest_v1/media/math/render/svg/287bce0849b56661bbaebca9942dfe3a6cadc21c\" alt=\"\\varepsilon _{r}\"/>=<strong>1.0005</strong>.</div>", "advice": "<p>Si obtuvo una respuesta incorrecta, recuerde tener presente lo siguiente:</p>\n<ul>\n<li>Convertir todas las unidades al SI</li>\n<li>Incuir la permitividad relativa del aire <img src=\"https://wikimedia.org/api/rest_v1/media/math/render/svg/287bce0849b56661bbaebca9942dfe3a6cadc21c\" alt=\"\\varepsilon _{r}\"/>=1.0005</li>\n<li>Introducir la distancia al cuadrado</li>\n</ul>\n<p>El campo el&eacute;ctrico $E$ debido a una carga puntual es</p>\n<p style=\"text-align: center;\">$\\displaystyle{q\\over 4 \\pi \\varepsilon_0 \\varepsilon_r r^2}$</p>\n<p>donde $r$ es la distancia radial con respecto a la carga fuente (la que produce el campo el&eacute;ctrico, la otra se denomina carga de prueba). La fuerza experimentada en un campo el&eacute;ctrico es en este contexto $\\vec{F}=q\\vec{E}$, por lo tanto, la fuerza ejercida sobre una carga $q_1$ debido al campo que produce la carga fuente $q_2$ (cualquiera puede ser considerada fuente o carga de prueba), tiene una magnitud de</p>\n<p style=\"text-align: center;\">$\\displaystyle q_1 {q_2\\over 4 \\pi \\varepsilon_0 \\varepsilon_r r^2}$.</p>\n<p>Debido a que generalmente $\\varepsilon_r\\ge1$, cualquier material entre las dos cargas tiende a reducir la fuerza experimentada entre las cargas en relaci&oacute;n a la misma situaci&oacute;n pero en el vac&iacute;o. Es importante notar que la pregunta se refiere al porcentaje en el cual la fuerza se ha reducido, no el porcentaje de la fuerza que se obtiene finalmente.</p>\n<p>La fuerza debida a la gravedad es $mg$ y se dirije hacia el centro de la Tierra, de este modo, uno puede calcular la fuerza debida a la presencia de un campo el&eacute;ctrico y trabajar enfocandose en el valor de la masa cuando, al ser multiplicada por $g$, tiene la misma magnitud.</p>", "rulesets": {}, "builtin_constants": {"e": true, "pi,\u03c0": true, "i": true}, "constants": [], "variables": {"g": {"name": "g", "group": "Ungrouped variables", "definition": "9.8", "description": "<p>Approximate value for the acceleration due to gravity on Earth's surface (m/s/s).</p>", "templateType": "anything", "can_override": false}, "eps0": {"name": "eps0", "group": "Ungrouped variables", "definition": "8.854*10^-12", "description": "<p>Permitividad del espacio vac&iacute;o en F/m.</p>", "templateType": "anything", "can_override": false}, "mass": {"name": "mass", "group": "Ungrouped variables", "definition": "force1/g", "description": "<p>Mass that would balance the force between the charges on Earth (kg).</p>", "templateType": "anything", "can_override": false}, "r1": {"name": "r1", "group": "Ungrouped variables", "definition": "random(0.5..2.5#0.5)", "description": "<p>Distance of the second point charge from the first in cm.</p>", "templateType": "anything", "can_override": false}, "epsmat": {"name": "epsmat", "group": "Ungrouped variables", "definition": "random(4..10#0.1)", "description": "<p>Randomised relative permittivity of material substituting for air (no units)</p>", "templateType": "anything", "can_override": false}, "q2": {"name": "q2", "group": "Ungrouped variables", "definition": "siground(random(0.5..2.5#0.5 except q1),2)", "description": "<p>Magnitude of charge for which the electric field is originating in $\\mu$C, randomised in steps of 0.5$\\mu$C from 0.5 to 2.5$\\mu$C, but different from $q_1$.</p>", "templateType": "anything", "can_override": false}, "epsair": {"name": "epsair", "group": "Ungrouped variables", "definition": "1.0005", "description": "<p>Relative permittivity of air (dimensionless quantity).</p>", "templateType": "anything", "can_override": false}, "force2": {"name": "force2", "group": "Ungrouped variables", "definition": "q1*q2*(10^(-12))/(4*pi*eps0*epsmat*(r1*(10^(-2)))^2)", "description": "", "templateType": "anything", "can_override": false}, "q1": {"name": "q1", "group": "Ungrouped variables", "definition": "siground(random(0.5..2.5#0.5),2)", "description": "<p>Magnitude of charge for which the force is to be obtained in $\\mu$C, randomised in steps of 0.5$\\mu$C from 0.5 to 2.5.</p>", "templateType": "anything", "can_override": false}, "force1": {"name": "force1", "group": "Ungrouped variables", "definition": "{q1}*{q2}*(10^(-12))/(4*pi*{eps0}*{epsair}*(r1*(10^(-2)))^2)", "description": "<p>Coulomb force on one charge due to another, in N, is given by $q_1q_2/4\\pi\\varepsilon r^2$.</p>", "templateType": "anything", "can_override": false}}, "variablesTest": {"condition": "", "maxRuns": 100}, "ungrouped_variables": ["eps0", "epsair", "epsmat", "force1", "force2", "g", "mass", "q1", "q2", "r1"], "variable_groups": [], "functions": {}, "preamble": {"js": "", "css": ""}, "parts": [{"type": "gapfill", "useCustomName": true, "customName": "Fuerza el\u00e9ctrica entre dos cargas puntuales", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p>Usando la Ley de Coulomb, calcule la fuerza ejercida sobre una carga puntual de {q1} $\\mu$C debida al el campo el&eacute;ctrico creado por una carga el&eacute;ctrica puntual de {q2} cuando la separaci&oacute;n de ellas es de {r1} cm (de aire).</p>\n<p style=\"text-align: center;\">$|\\vec{F}| =$ [[0]]&nbsp;Newtons.&nbsp;</p>", "gaps": [{"type": "numberentry", "useCustomName": true, "customName": "force", "marks": "2", "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "minValue": "{force1}*0.995", "maxValue": "{force1}*1.005", "correctAnswerFraction": false, "allowFractions": false, "mustBeReduced": false, "mustBeReducedPC": 0, "precisionType": "sigfig", "precision": "4", "precisionPartialCredit": "0", "precisionMessage": "You have not given your answer to the correct precision.", "strictPrecision": true, "showPrecisionHint": false, "notationStyles": ["plain", "en", "si-en", "scientific"], "correctAnswerStyle": "plain"}], "sortAnswers": false}, {"type": "gapfill", "useCustomName": true, "customName": "Efectos de la permitividad", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p>&iquest;Cu&aacute;l es el porcentaje <strong>de reducci&oacute;n de la fuerza</strong> cuando el aire es reemplazado por un material cuya permitividad el&eacute;ctrica relativa es&nbsp;$\\varepsilon_r =\\var{epsmat}$?&nbsp;&nbsp;</p>\n<p style=\"text-align: center;\">La fuerza experimenta una reducci&oacute;n de&nbsp; [[0]]&nbsp;%</p>", "gaps": [{"type": "numberentry", "useCustomName": true, "customName": "Porcentaje", "marks": "2", "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "minValue": "(force1-force2)/force1*99.5", "maxValue": "(force1-force2)/force1*100.5", "correctAnswerFraction": false, "allowFractions": false, "mustBeReduced": false, "mustBeReducedPC": 0, "precisionType": "sigfig", "precision": "4", "precisionPartialCredit": 0, "precisionMessage": "La respuesta entregada no posee la precisi&oacute;n requerida.", "strictPrecision": true, "showPrecisionHint": false, "notationStyles": ["plain", "en", "si-en", "scientific"], "correctAnswerStyle": "plain"}], "sortAnswers": false}, {"type": "gapfill", "useCustomName": true, "customName": "Equilibrio con la fuerza gravitacional", "marks": 0, "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], "variableReplacementStrategy": "originalfirst", "nextParts": [], "suggestGoingBack": false, "adaptiveMarkingPenalty": 0, "exploreObjective": null, "prompt": "<p>Si en este caso particular la fuerza gravitacional en la superficie de la tierra (o en sus cercan&iacute;as) se equilibra con la fuerza el&eacute;ctrica en una carga puntual $\\var{q1}\\,\\mu\\text{C}$ debido a otra carga puntual $\\var{q2}\\,\\mu\\text{C}$ (la fuente) &iquest;cu&aacute;l es su masa? considere que la aceleraci&oacute;n gravitacionesl es {g} N/kg.</p>\n<p style=\"text-align: center;\">La masa en equilibrio traslacional es [[0]] kg</p>", "gaps": [{"type": "numberentry", "useCustomName": true, "customName": "mass", "marks": "2", "scripts": {}, "customMarkingAlgorithm": "", "extendBaseMarkingAlgorithm": true, "unitTests": [], "showCorrectAnswer": true, "showFeedbackIcon": true, "variableReplacements": [], 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