If 1010 electrons are acquired by a body every second, the time required for the body to get a total charge of 1 C will be

If 1010 electrons are acquired by a body every second, the time required for the body to get a total charge of 1 C will be

  1. A

    2h

  2. B

    2 days

  3. C

    2 yr

  4. D

    20 yr

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    Solution:

    1 electron has a charge of 1.6 x 10-19 C.
    1010 electrons would have a charge of
    q = ne = 1.6 x 10-19  x 1010
    = 1.6 x 10-9 C
    Thus, in Is charge accumulated = 1.6 x 10-9 C
    So, time taken to accumulate 1 C

    =11.6×10-9=0.625×109

    = 6.25 x 108 s = 173611 h
    = 7233 days  20 yr

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