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19 November, 02:45

A solenoid is built with 870 turns uniformly distributed over a length of 0.390 m to produce a magnetic field of magnitude 1.00 * 10-4 T at its center. What is current necessary for this to happen? 17.4 mA 35.7 mA 74.9 mA

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  1. 19 November, 03:08
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    35.7mA

    Explanation:

    B = μnI

    μ: permeability of free space 4π * 10^-7

    n: number of turns per unit length

    I: current through the coil

    B: magnetic field

    1.00 * 10-4 = 4π * 10^-7 * 870/0.39*I

    I = 35.7mA
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