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CMC Medical CMC-Medical Ludhiana Solved Paper-2007

  • question_answer
    The current in a coil changes from 0 to 2 A in 0.05s. If the induced emf is 80V. the self-inductance of the coil is

    A)  1 H                                        

    B)  0.5 H

    C)  1.5 H                                    

    D)  2 H

    Correct Answer: D

    Solution :

                    From the formula, \[\varepsilon =-L\frac{dI}{dt}\] Take magnitude on both sides. \[\left| \,\varepsilon \, \right|=\left| -L\frac{d\,I}{dt} \right|\] or            \[\varepsilon =L\frac{d\,I}{dt}\] \[\therefore \]  \[80=L\left( \frac{2}{0.05} \right)\] \[\Rightarrow \]               \[80=L\times 40\] \[\Rightarrow \]               \[L=\frac{80}{40}\] \[\Rightarrow \]               \[L=2H\]


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