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

  • question_answer
    A coil has an inductance of 2.5 H and a resistance of 0.5 r. If the coil is suddenly connected across a 6.0 volt battery, then the time required for the current to rise 0.63 of its final value is                                       [AMU 1995]

    A)            3.5 sec                                     

    B)            4.0 sec

    C)            4.5 sec                                     

    D)            5.0 sec

    Correct Answer: D

    Solution :

               \[t=\tau =\frac{L}{R}=\frac{2.5}{0.5}=5\ \sec \]


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