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- If E ≠ 0, V cannot be zero.
- none of these.
- If V = 0, E must be zero.
- If V ≠ 0, E cannot be zero.

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if V=0, we can not say E must be zero, we say only E may be zero.

if V≠0, E must be zero when V is max i.e, dVdx=0

if E≠0 , V may be zero when two equal and opposite charges separated by a distance and at the midpoint in between the charges field non-zero but potential is zero.

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