Question

A vertical, rectangular loop of copper wire is half in and half out of the horizontal magnetic field in FIGURE (The field is zero beneath the dashed line.) The loop is released and starts to fall. Is there a net magnetic force on the loop? If so, in which direction? Explain

Short answer

Yes, there is a net upward force.

Step-by-step solution

Introduction

The current-carrying portion of oblong is near a protractor long straight wire that runs parallel to one of the loop's sides. The loop will close if a constant current I is established within the wire. It revolve around an axis perpendicular to the wire

Lenz law

In electromagnetism, Lenz's law states that an induced current flows within the reverse direction of the change that caused it. Heinrich Friedrich Emil Lenz (1804–65), a Russian scientist, deduced this law in 1834.

According to the Lenz law,

Because the highest top loop segment traverses the sphere field while the lower loop segment does't (the two side segments produce forces of equal magnitude but in different directions), the net force are going to the upward. It must oppose the gravitational attraction that's generating the flow change.