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. Hence  is correct.