Charges are placed on the vertices of a ...

Charges are placed on the vertices of a square as shown in figure below. Let E be the electric field and V be the potential at the centre. If the charges on A and B are interchanged with those on D and C respectively, then :

`vec(E)` remains uncharges, V charges

Both `vec(E)` and V change

`vec(E)` and V remain unchanged

`vec(E)` changes, V remains unchanged

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