   Chapter 20.2, Problem 20.3QQ

Chapter
Section
Textbook Problem

Two circular loops are side by side and lie in the xy-plane. A switch is closed, starting a counterclockwise current in the left-hand loop, as viewed from a point on the positive z-axis passing through the center of the loop. Which of the following statements is true of the right-hand loop? (a) The current remains zero. (b) An induced current moves counterclockwise. (c) An induced current moves clockwise.

To determine
The direction of induced current.

Explanation

Lenz’s law states that the induced current flows in such a direction that the magnetic field associated to it tends to oppose the change that produces it.

Conclusion:

The current in the left hand loop produces a positive flux. The magnetic field associated to it is along negative direction.

As a result, the right hand loop will have an increasing negative flux. The induced current opposes this by producing a magnetic field that is along the positive z direction...

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