(II) When an object such as a plastic comb is charged by rubbing it with a cloth, the net charge is typically a few microcoulombs. If that c

Question

(II) When an object such as a plastic comb is charged by rubbing it with a cloth, the net charge is typically a few microcoulombs. If that charge is 3.0 C, by what percentage does the mass of a 9.0-g comb change during charging?

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Phúc Điền 4 years 2021-07-27T14:35:14+00:00 1 Answers 314 views 0

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  1. Tryphena
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    2021-07-27T14:36:20+00:00
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    Answer:

    1.9*10^-13 %

    Explanation:

    One electron represents -1.6*10^-19 C

    3 μC are equivalent to 3*10^-6 C

    After loss 3 μC, the amount of electron loss is:

    e = (-3*10^-6) / (-1.6*10^-19) = 1.875*10^13

    One electron has 9.10938356*10^-28 grams, then the mass lost is:

    m = 1.875*10^13 * 9.10938356*10^-28 = 1.7*10^-14 g

    The percentage loss is:

    (1.7*10^-14 / 9) * 100 = 1.9*10^-13 %

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