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(A) According to Lenz's law,the direction of the induced current is such that it opposes the change in magnetic flux that produced it.$(i)$ The rectan

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(A) According to Lenz's law,the direction of the induced current is such that it opposes the change in magnetic flux that produced it.$(i)$ The rectangular loop $abcd$ is moving into the magnetic field region. The magnetic flux through the loop increases. To oppose this increase,the induced current must create a magnetic field directed out of the page. By the right-hand rule,the induced current flows in the counter-clockwise direction,i.e.,along $adcba$.(ii) The triangular loop $abc$ is moving out of the magnetic field region. The magnetic flux through the loop decreases. To oppose this decrease,the induced current must create a magnetic field directed into the page. By the right-hand rule,the induced current flows in the clockwise direction,i.e.,along $abc$.(iii) The irregular loop $abcd$ is moving out of the magnetic field region. The magnetic flux through the loop decreases. To oppose this decrease,the induced current must create a magnetic field directed into the page. By the right-hand rule,the induced current flows in the clockwise direction,i.e.,along $abcda$.

The following figure shows planar loops of different shapes moving into or out of a region of a magnetic field which is directed normal to the plane of the loop,away from the reader. Determine the direction of the induced current in each loop using Lenz's law.

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