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    For Q6.b. http://www.ocr.org.uk/Images/144798-...k-universe.pdf I don't understand how you can tell that the field direction is always towards the centre of the sphere by looking at the graph (that is the correct answer).
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    (Original post by pippabethan)
    For Q6.b. http://www.ocr.org.uk/Images/144798-...k-universe.pdf I don't understand how you can tell that the field direction is always towards the centre of the sphere by looking at the graph (that is the correct answer).
    I think it's because every value on the graph would be negative (except zero), and negative, in terms of forces, means attractive?
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    (Original post by Laurasaur)
    I think it's because every value on the graph would be negative (except zero), and negative, in terms of forces, means attractive?
    That was my thinking, but I wasn't sure! Thank you
 
 
 
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