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7 July, 19:48

A 139-turn circular coil of radius 2.13 cm is immersed in a uniform magnetic field that is perpendicular to the plane of the coil. during 0.175 s the magnetic field strength increases from 57.7 mt to 92.1 mt. find the magnitude of the average emf, in millivolts, that is induced in the coil during this time interval.

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  1. 7 July, 23:43
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    Change in magnetic flux = no of turns x area of coil x change in magnetic field.

    = 139 x π R² x (92.1 - 57.7) x 10⁻³

    = 139 x 3.14 x 2.13²X 10⁻⁴ x 34.4 x 10⁻³

    = 6.8118 x 10⁻³ Weber

    rate of change of flux = change of flux / time

    = 6.8118 x 10⁻³ /.175

    = 38.925 mV.
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