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CMC Medical CMC-Medical VELLORE Solved Paper-2015

  • question_answer
    The average of induced emf in coil in which current changes from 0.2 A to 0.4 A in 0.1 is 1 V, the self inductance of the coil is

    A)  0.2 H                    

    B)  0.5 H

    C)  0.3 H                    

    D)  0.4 H

    E)  0.1 H

    Correct Answer: B

    Solution :

                    Given, \[e=1\,V,\]\[\frac{dI}{dt}=\frac{0.4-0.2}{0.1}\] \[\Rightarrow \]               \[\frac{dI}{dt}=2A{{s}^{-1}}\] As,          \[e=L\frac{dI}{dt}\] \[\Rightarrow \]               \[L=\frac{e}{\frac{dI}{dt}}=\frac{1}{2}=0.5\,H\]


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