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17 September, 19:37

If the force experienced by a positively charged balloon is 2.7 newtons and the electric field strength is 7.8 * 105 newtons/coulomb, what is the magnitude of the charge on the balloon?

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  1. 17 September, 19:45
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    If you're careful about units, then you can do just about anything with

    the two given quantities, and the answer will fall out on the desk right

    there in front of you:

    (2.7 newtons) / (7.8x 10⁵ newtons/coulomb)

    Divide numerator

    and denominator

    by (newton), and

    you have (2.7 coulomb) / (7.8 x 10⁵) = 3.46 x 10⁻⁶ coulomb

    = 3.46 micro-coulombs

    Notice that you didn't describe the direction of the force on the balloon, so

    the flavor of the charge on it doesn't matter. A negatively charged balloon

    with 3.46 microcoulombs on it would feel exactly the same force, but it would

    be in the other direction.
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