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14 October, 22:41

How much current must flow through a wire to make a magnetic field as strong as Earth's field (5.00 x 10^-5 T) 1.00 m away from the wire?

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  1. 14 October, 23:01
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    250 A

    Explanation:

    B = 5 x 10^-5 T, r = 1 m

    Let current be i.

    the magnetic field due to a straight current carrying conductor is given by

    B = μ0 / 4π x 2i / r

    5 x 10^-5 = 10^-7 x 2 x i / 1

    i = 250 A
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