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

Question

Physics

Shelby Mosley

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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Answers (1)

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Rogelio Kelley · Answer 1

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