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Question

The figure illustrates plane figures made of thin conductors which are located in a uniform magnetic field directed away from the reader, perpendicular to the plane of drawing. The magnetic field starts decreasing. The currents induced in these loops are directed as


A

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B

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C

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D

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Solution

The correct options are
A

C

D

According to Lenz, the sense of inducced e.m.f. is such that it opposes the cause of change of flux. In our problem, magnetic field is directed away from the reader and is decreasing.


So, in figure (a), in the round conductor, it is clockwise and there is no current in the connector
In figure (b) in the outside conductor, clockwise.
In figure (c) in both the conductor, clockwise; and there is no current in the connector to obey the charge conservation.

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