Question

4 charges are placed each at distance ‘a’ from origin. The dipole moment of configuration is

(A) 2 q a j

(B) 3 q a j 

(C) 2 a q [i +j]

(D) None 

Answer 1

Correct option (A) 2 q a j

Explanation: 

Center of charge) of negative charges is origin 

(center of charge) of positive charges is

Dipole moment