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15 December, 14:51

N object has a charge of - 2.0 μc. how many electrons must be removed so that the charge becomes + 2.2 μc?

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  1. 15 December, 16:06
    0
    Electrical Charge is a property of matter that causes it to experience a force when place in an electromagnetic field. Charge is measured in coulombs.

    The change in the charge is 2.2 - (2.0) = 4.2 μ c.

    1 electron has a charge of 1.6 * 10∧-19 coulombs

    Therefore, the number of electrons will be;

    = (4.2 * 10∧-6) / (1.6 * 10∧-19)

    = 2.625 * 10∧13 electrons
  2. 15 December, 18:05
    0
    Current charge = - 2.0 micro C

    Charge needed = + 2.2 micro C

    So the net charge is 4.2 micro C

    The charge on one electron = - 1.602 x 10^-19 C

    Calculating the net change in the number of electrons = 4.2 x 10^-6 / - 1.602 x 10^-19 = - 2.621 x 10^13

    The negative sign implies the number of electrons that needs to be removed that is 2.621 x 10^3
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