JEE Main & Advanced Physics Electro Magnetic Induction Question Bank Static EMI

  • question_answer
    A solenoid has an inductance of 60 henrys and a resistance of 30 ohms. If it is connected to a 100 volt battery, how long will it take for the current to reach \[\frac{e-1}{e}\approx 63.2%\] of its final value                                 [MP PET 2000]

    A)            1 second                                

    B)            2 seconds

    C)            e seconds                              

    D)            2e seconds

    Correct Answer: B

    Solution :

               \[t=\tau =\frac{L}{R}=\frac{60}{30}=2\,\sec .\]


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