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Just Checking Whether This Answer is Right

  1. Jun 14, 2009 #1
    A pith ball of mass 0.15mg is suspended off a massless string as shown below. The string is 30cm long.


    Apparently the answer is 2.6x10^9C but I got 2.6x10^-9C.

    I don't want a solution or anything, I just want to see whether their answer is correct or not and if whether anyone could verify that for me.

    Thanks in advance.
  2. jcsd
  3. Jun 14, 2009 #2
    seems a typo, you're answer is right
  4. Jun 14, 2009 #3


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    Homework Helper

    Note the magnitude of the answer: 2.6 billionth of a coulomb. In electrostatics questions, any answer bigger than several millionths of a coulomb is almost certain to be wrong.
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