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 :

`vecE` changes, V remains unchanged

`vecE` remains unchanged, V changes

Both `vecE` and changes

`vecE` and V remain unchanged

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