Physics Fields Question Watch

Dentist95
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Hi guys,

can someone explain to me how you solve question 13 and 15 on this paper? Thanks

http://filestore.aqa.org.uk/subjects...1-QP-JUN14.PDF
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tiddlytom
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What is the relationship between force and distance (for question 13) and potential and distance (for question 15)? (these are standard equations which should be remembered)

If you can remember one but not the other, then you can consider that the potential is the integral of the force, and the force the derivative of the potential.
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