Question

Three point charges Q, 4Q and 16Q are placed on a straight line 9 cm long. Charges are placed in such a way that the system has minimum potential energy. Then 

(A) 4Q and 16Q must be at the ends and Q at a distance of 3 cm from the 16Q. 

(B) 4Q and 16Q must be at the ends and Q at a distance of 6 cm from the 16Q. 

(C) Electric field at the position of Q is zero. 

(D) Electric field at the position of Q is Q/4πε₀

Answer 1

Correct Option (B, C)

Explanation:

For the system to be at minimum potential energy, the higher charged particles should be far apart.