DV=Ed? When valid?

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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?
 

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Dale
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Wouldn't E need to be uniform for this to be true?
Yes, this is right.
 
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Ok thank you.
 

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