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CMC Medical CMC-Medical Ludhiana Solved Paper-2007

  • question_answer
    A coil is wound on a frame of rectangular cross-section. If all the linear dimensional frame are increased by a factor of 2 and the number of turns per unit length of the coil remains the same, self-inductance of the coil increases by a factor of

    A)  4                                            

    B)  8

    C)  12                                         

    D)  16

    Correct Answer: B

    Solution :

                    From the relation\[L={{\mu }_{0}}{{n}^{2}}Al\] If all the dimensions of the frame are increased by a factor of 2, then area is increased by a factor of 4 and length by a factor of 2. Hence, L becomes 8 times.


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