What is the Relationship Between Electric Field and Potential?

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shirel
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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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Discussion

shirel said:
V=kq/r
What's dV/dr for that potential? Compare that to E.
 

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