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JEE Main & Advanced Physics Electro Magnetic Induction Question Bank Critical Thinking

  • question_answer
    Two identical circular loops of metal wire are lying on a table without touching each other. Loop-A carries a current which increases with time. In response, the loop-B [IIT JEE 1999; UPSEAT 2003]

    A)            Remains stationary

    B)            Is attracted by the loop-A

    C)            Is repelled by the loop-A

    D)            Rotates about its CM, with CM fixed (CM is the centre of mass)

    Correct Answer: C

    Solution :

               If the current increases with time in loop A, then magnetic flux in B will increase. According to Lenz's law, loop ?B is repelled by loop ?A.


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