Question

Question 18 5 pts O o I B A square loop of wire carries current in the clockwise direction in a uniform magnetic field that points out of the screen, as shown. Which best describes the net force on the square loop? The net force is non-zero and points to the right. The net force is zero, and it tries to shrink the loop. The net force is non-zero and points to the left. The net force is zero, and it tries to expand the loop.

Answer 1

The net force is zero and it tries to shrink the loop.

This is because,

$\bar F = I(\bar {dL} \times \bar B)$

Now according to right hand rule,

1. In the right side of the loop, dL is downward and force is towards left.

2. In the left side of the loop, dL is upward and force is towards right.

3. In the top part of the loop, dL is towards right and force is downward.

4. In the bottom part of the loop, dL is towards left and force is downward.