question_answer

Two long freely hanging wires firstly joined in parallel and then in series. When the two combinations are connected with a battery, then which type of force acts between the two wires in two cases?

A)  Repulsive force in both cases

B)  Attractive force in both cases

C)  Repulsive force when in parallel and attractive force when in series

D)  Attractive force when in parallel and repulsive force when in series

Correct Answer: D

Solution :

                When connected in parallel the current will be in the same direction, hence the force is attractive. When connected in series the current will be in the opposite direction hence the force is repulsive.