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25 March, 20:00

A copper wire of length 16 cm is in a magnetic field of 0.19 T. If it has a mass of 9.0 g, what is the minimum current through the wire that would cause a magnetic force equal to its weight?

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  1. 25 March, 20:22
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    2.9 A

    Explanation:

    L = 16 cm = 0.16 m

    B = 0.19 T

    m = 9 g = 0.009 kg

    Let the minimum current be i.

    Magnetic force is balanced by the gravitational force

    B x i x L = m x g

    0.19 x i x 0.16 = 0.009 x 9.8

    i = 2.9 A
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