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    "url": "https://numbas.mathcentre.ac.uk/api/questions/12082/?format=api",
    "name": "Find a unit normal vector to a surface given in Cartesian form",
    "published": true,
    "project": "https://numbas.mathcentre.ac.uk/api/projects/601/?format=api",
    "author": {
        "url": "https://numbas.mathcentre.ac.uk/api/users/697/?format=api",
        "profile": "https://numbas.mathcentre.ac.uk/accounts/profile/697/?format=api",
        "full_name": "Newcastle University Mathematics and Statistics",
        "pk": 697,
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    "edit": "https://numbas.mathcentre.ac.uk/question/12082/find-a-unit-normal-vector-to-a-surface-given-in-ca/?format=api",
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    "download": "https://numbas.mathcentre.ac.uk/question/12082/find-a-unit-normal-vector-to-a-surface-given-in-ca.zip?format=api",
    "source": "https://numbas.mathcentre.ac.uk/question/12082/find-a-unit-normal-vector-to-a-surface-given-in-ca.exam?format=api",
    "metadata": {
        "notes": "<p><strong>19/11/2013</strong></p>\n    <p>Set p1/=0, p4=p7=0, so that the x-derivative in part a) is never zero. &nbsp;This avoids division by zero when calculating n1hat.</p>\n    <p>q[1]-&gt;q[0] in definition of n2.</p>\n    <p>Set p12=0, so that the x-derivative in part b) is never zero. &nbsp;This avoids division by zero when calculating n2hat.</p>\n    <p><strong>12/11/2013</strong></p>\n    <p>Set a2 not equal to b2, to avoid any degenerate surfaces in part b).</p>",
        "licence": "Creative Commons Attribution 4.0 International",
        "description": "<p>Unit normal vector to a surface, given in Cartesian form.</p>"
    },
    "status": null,
    "resources": []
}