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# equipotential lines watch

1. A edexcel unit 5 questions is asking me to draw three subsequent equipotential lines.

I drew them equal distance apart, the markscheme has them increasing distance apart...

I thought V = GM/r so therefore as you double the radius the potential halves. so how come, between subsequent lines, the radius is getting much larger?
2. Because it's a radial feild.
3. I know that already, what is your point?
4. I think its jsut the inverse square law...so it doubles...
5. V = -GM/r, that is not inverse square, just inversely proportional.
6. knowledge of V = -GM/r is not required in the edexcel sylabus
7. (Original post by sumitk87)
knowledge of V = -GM/r is not required in the edexcel sylabus
yea it isnt
8. (Original post by mik1w)
A edexcel unit 5 questions is asking me to draw three subsequent equipotential lines.

I drew them equal distance apart, the markscheme has them increasing distance apart...

I thought V = GM/r so therefore as you double the radius the potential halves. so how come, between subsequent lines, the radius is getting much larger?
think of it matheatically - its not direct proportion - its inversely proportional, so when you increase r a bit, it doesn't imply that V will decrease uniformly; recall the graph of y=1/x and compare it to that

pk
9. The distance between two lines indicates the field strength. It decreases as you go further out so the equipotential lines get further apart

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