In a physics laboratory experiment, a coil with 250 turns. Each turn of the coil

Question

In a physics laboratory experiment, a coil with 250 turns. Each turn of the coil encloses an area of 7.0 cm2 . The coil is rotated from a position where its plane is perpendicular to the earth's magnetic field to one where its plane is parallel to the field. The rotation takes 3.0×102 s . The earth's magnetic field at the location of the laboratory is 6.0×105 T

What is the average emf induced in the coil as it is rotated from the perpendicular to the parallel orientation?

Express your answer using two significant figures, E=____ mV

Explanation / Answer

initial flux = NBA COS0 = NBA = 250*6*10^-5*7*10^-4 = 0.105 *10^-4 Tm^2

final flux = NBACOS90 = 0

EMF = CHANGE IN FLUX /TIME = 0.105*10^-4/0.03 = 0.35 mV

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