Two small identical metallic balls having charges q and -2q are kept far at a separation r. They are brought in contact and then separated at distance r/2. Compared to the initial force F, they will now :

Two small identical metallic balls having charges q and -2q are kept far at a separation r. They are brought in contact and then separated at distance r/2. Compared to the initial force F, they will now :
(A) attract with a force F/2
(B) repel with a force F/2
(C) repel with a force F
(D) attract with a force F

Correct Answer : (B) repel with a force F/2