A magnetic field that is decreasing with time is directed out ofthe page and pas

Question

A magnetic field that is decreasing with time is directed out ofthe page and passes through a circular loop of wire in the plane ofthe page. Which of the following is true of the induced current inthe wire loop? 1. It is counterclockwise in direction. 2. It is zero in magnitude. 3. It is clockwise in direction. 4. It is directed out of the page. 5. It is directed into the page. 1. It is counterclockwise in direction. 2. It is zero in magnitude. 3. It is clockwise in direction. 4. It is directed out of the page. 5. It is directed into the page.

Explanation / Answer

According to the Lenz's law, an induced current flows in a direction that opposes the change causing it. I think in this way: As the out-of-paper magnetic field is decreasing in magnitude, the induced current should produce a magnetic field which minimizes the effect of such a change. Therefore, a out-of-paper magnetic field should be generated. Thus, the induced current should flow in a counterclockwise direction by the right-hand grip rule.

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