JEE Main & Advanced Sample Paper JEE Main Sample Paper-5

  • question_answer
    The value of time constant for given circuit is

    A)  1s                                          

    B)  2 s

    C)  3 s                                         

    D)  4 s

    Correct Answer: D

    Solution :

     After short circuiting, the battery \[{{R}_{ab}}=\frac{(2+3)\times 5}{(2+3+5)}=2.5\Omega \] \[2\Omega \]and\[3\Omega \]are in series and this combination is in parallel with\[5\Omega \] Now, time constant\[\tau =\frac{L}{{{R}_{ab}}}=\frac{10}{2.5}=4\]s

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