A level physics multiple choice Q help - Electric force

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muhammad0112
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Two identical positive point charges, P and Q, separated by a distance r, repel each other
with a force F. If r is decreased so that the electrical potential energy of Q is doubled, what
is the force of repulsion?

A 0.5 F
B F
C 2F
D 4F

The answer is D

I made a Voice note cos it's easiar:https://mote.fyi/3pd5dd8
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Callicious
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Potential is proportional to \frac{1}{r} and force is proportional to \frac{1}{r^2}. Does that help?
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muhammad0112
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(Original post by Callicious)
Potential is proportional to \frac{1}{r} and force is proportional to \frac{1}{r^2}. Does that help?
ohh. I already knew that but I just realised that I misread the Q. whoops.
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Cherrygrape1234
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(Original post by muhammad0112)
ohh. I already knew that but I just realised that I misread the Q. whoops.
Hi
Do you know how to answer these 2:
1) Name:  BF99815B-AFCB-47C8-BB6C-B52AC7D41701.jpeg
Views: 3
Size:  50.4 KB
2)Name:  2ECB0518-3B99-4BFE-95E5-022B0A477459.jpeg
Views: 3
Size:  33.7 KB
Last edited by Cherrygrape1234; 1 month ago
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muhammad0112
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(Original post by Cherrygrape1234)
Hi
Do you know how to answer these 2:
1) Name:  BF99815B-AFCB-47C8-BB6C-B52AC7D41701.jpeg
Views: 3
Size:  50.4 KB
2)Name:  2ECB0518-3B99-4BFE-95E5-022B0A477459.jpeg
Views: 3
Size:  33.7 KB
Nah, my school decided not to test us on magnetic fields and waves.
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