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Charges are placed on the vertices of a square as shown

Let `vecE` be the electric field and V the potential at the centre. If the charges on A and B are interchanged with those on D and C respectively, then

A

`vec(E)` remains unchaged, V changes

B

both `vec(E)` and V change

C

`vec(E)` and V remain unchanged

D

`vec(E)` change, V remains unchanged

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The correct Answer is:
D
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