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    Jackman2013's Avatar
    Jackman2013 Posts: 2, Reputation: 1
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    #1

    Jun 30, 2013, 12:32 AM
    Ask physics questions and get answers
    What is the repulsive force between two pith balls that are 8 cm apart and have equal charges of -30 nC?
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    Jackman2013 Posts: 2, Reputation: 1
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    #2

    Jun 30, 2013, 12:36 AM
    Common static electricity involves charges ranging from nanocoulombs to microcoulombs. How many electrons are needed to form a charge of -2.00 nC?
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    ebaines Posts: 12,131, Reputation: 1307
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    #3

    Jul 1, 2013, 11:56 AM
    For (1) apply Coulomb's Law:



    For your second question the charge of one electron is approximately 1.602 x 10^(-19) coulomb's. So 1 coulombs is the charge of 1/(1.69 x 10^(-19) ) electrons. Can you finish the problem from here?

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