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  • Jun 30, 2013, 12:32 AM
    Jackman2013
    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?
  • Jun 30, 2013, 12:36 AM
    Jackman2013
    Common static electricity involves charges ranging from nanocoulombs to microcoulombs. How many electrons are needed to form a charge of -2.00 nC?
  • Jul 1, 2013, 11:56 AM
    ebaines
    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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