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 :

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.