Charges are placed on the vertices of a square as shown. Let E r 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 :-

Options

A. (a)E remains unchanged, V changes
B. (b)both E and V change
C. (c)E and V remain unchanged
D. (d)E changes, V remains unchanged

Answer

D

Explanation

Direction of E reverses while magnitude remains same and V remains unchanged.