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16 October, 16:29

A wire loop of radius 0.37 m lies so that an external magnetic field of magnitude 0.35 T is perpendicular to the loop. The field reverses its direction, and its magnitude changes to 0.20 T in 1.4 s. Find the magnitude of the average induced emf in the loop during this time

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  1. 16 October, 17:55
    0
    168.57 mV

    Explanation:

    Initial magnetic flux = BA, B magnetic field and A is area of loop

    =.35 x 3.14 x. 37²

    =.15 Weber

    Final magnetic flux

    = -.2 x 3.14 x. 37²

    = -.086 Weber

    change in flux

    .15 +.086

    =.236 Weber

    rate of change of flux

    =.236 / 1.4

    =.16857 V

    = 168.57 mV
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