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18 June, 18:10

What EMF is produced if a waffle iron that draws 2.5 amperes and has an inductance of 560 millihenries is suddenly unplugged, so the current drops to essentially zero in 0.015 seconds

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  1. 18 June, 18:24
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    93 V

    Explanation:

    use the expression for induced emf as

    EMF = L dI/dt

    L = 560 x 10⁻³

    dI = 2.5 A

    dt = 0.015 s = 15 x 10⁻³ s

    EMF = L dI/dt

    = 0.560 * 2.5/0.015

    = 93.33 V

    ≅ 93 V
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