question_answer

A rectangular loop of wire with dimensions shown is coplanar with a long wire carrying current I. The distance between the wire and the left side of the loop is r. The loop is pulled to the right as indicated. What are the directions of the induced current in the loop and the magnetic forces on the left and right sides of the loop as the loop is pulled?

A)

Induced current	Force on left side	Force on right side
Counterclockwise	To the left	To the right

B)

Induced current	Force on left side	Force on right side
Counterclockwise	To the left	To the right

C)

Induced current	Force on left side	Force on right side
Clockwise	To the left	To the right

D)

Induced current	Force on left side	Force on right side
Clockwise	To the left	To the right

Correct Answer: D

Solution :

 As flux decreases to maintain flux, current in loop is clockwise. Force on DA due to long wire is towards left while on wire BC towards right.