What is the Relationship Between Electric Field and Potential?

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shirel

Hi,

I don't understand why dV/dr=-E

As far as I know:
V=kq/r
E=Kq/(r^2)
so V/r becomes to be E and not -E.

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Doc Al

Mentor

shirel said:

V=kq/r

What's dV/dr for that potential? Compare that to E.

shirel

ohh I should derivate the function! thank you :)

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