DV=Ed? When valid?

[mk9898]

Hello,

When exactly is $\Delta V = Ed$? Wouldn't E need to be uniform for this to be true? And if for example we have a sphere and we would like to know the potential from the surface to a certain point, then wouldn't we have to assume that E is uniform everywhere i.e. constant to take it out of the integral?

 

[Dale]

Wouldn't E need to be uniform for this to be true?

Yes, this is right.

 

[mk9898]

Ok thank you.