Charges are placed on the verticles of a as shown. Let `vec(E)` be the electric field and V the potential at the centre. If the charges on a and B are inercharged with those on D and C respectively, then-

Options

A. `vec(E)` remains unchanged, V changes
B. both `vec(E)` and V change
C. `vec(E)` and V remain unchanged
D. `vec(E)` charges and V remains unchanged

Answer

D

Explanation

Potential remains same as it depends on algebraic sum of charges but electric field `vec(E)` charges.