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JAMIA MILLIA ISLAMIA Jamia Millia Islamia Solved Paper-2013

  • question_answer
        When the current changes from\[+2A\] to\[-2A\] in 0.05 s, an emf of 8 V is induced in a coil. The coefficient of self induction of the coil is

    A)  0.2 H                                    

    B)  0.4 H  

    C)  0.8 H                    

    D)  0.1 H

    Correct Answer: D

    Solution :

                    We know that, \[e=-L\frac{di}{dt}\] \[=-L\frac{(-2-2)}{0.05}\] \[8=L\left( \frac{4}{0.05} \right)\] \[L=\frac{8\times 0.05}{4}\] \[=0.1\,H\]                         


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