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    neomorcon's Avatar
    neomorcon Posts: 1, Reputation: 1
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    #1

    Dec 12, 2013, 12:12 AM
    equation for magnetic force
    What is the equation for the force from a magnet needed to move a penny?
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Dec 12, 2013, 06:56 AM
    This is a trick question. A US penny is composed of copper and zinc, neither of which is magnetic. So the equation for how a magnet affects a penny is force = 0.
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #3

    Dec 12, 2013, 07:32 AM
    Would have to be a WWII steel penny.
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