question_answer

In the given figure, the loop is fixed but straight wire can move. The straight wire will:

A)  remain stationary

B)  move towards the loop

C)  move away from the loop

D)  rotates about the axis

Correct Answer: B

Solution :

If we consider a small element dl.(shown in figure) the magnetic force on the considered element is towards the straight wire, because the direction of the current in the element is same as that in the straight wire. Hence, the correction option is [b].