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10 April, 07:20

The magnetic field a distance 2 cm from a long straight current-carrying wire is 2 * 10-5 t. the current in the wire is:

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  1. 10 April, 07:36
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    Current in the wire = 2 A

    Explanation:

    the magnetic field is given by

    B = / frac{/mu i}{2/pi r}

    μo = 4π x 10⁻⁷ Tm/A

    i = current

    r=0.02 m

    B = magnetic field = 2 x 10⁻⁵ T

    2 x 10⁻⁵ = (4π x 10⁻⁷) (i) / (2π*0.02)

    i=2 A
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