Question

A rectangular loop has width w and length l, and carries current i. It is placed in a uniform magnetic field B, as shown. The magnetic field is parallel to the plane containing the loop. Which of the followinf statement(s) is/are correct?

1. The current loop experiences a net force

2. The current loop experiences no net force

3. The magnetic dipole moment of the loop μ points into the page

4. The magnetic dipole moment of the loop μ points out of the page

5. The current loop experiences no net torque

6. The current loop experiences a net torque

A. Only 2 and 5 are correct

B. Only 1 and 6 are correct

C. Only 1, 3 and 4 are correct

D. Only 2, 4 and 5 are correct

E. Only 2, 4 and 6 are correct

Answer 1

since the opposite sides of the rectangle experience the same magnitude of force but opposite in direction ,hence Net force acting on the loop is zero

Net Torque is T = B*i*A which is not zero

curl your right hand fingers in the direction of current then thumb gives the direction of magnetic dipole moment

hence direction of dipole moment is out of the page

so final answer is E,only 2,4 and 6 are correct