A coil has 240 turns enclosing an area of 11.0 cm2 . In a physics laboratory exp

Question

A coil has 240 turns enclosing an area of 11.0 cm2 . In a physics laboratory experiment, the coil is rotated during the time interval 3.40×102 s from a position in which the plane of each turn is perpendicular to Earth's magnetic field to one in which the plane of each turn is parallel to the field. The magnitude of Earth's magnetic field at the lab location is 5.10×105 T .

a. What is the magnitude initial of the magnetic flux through the coil before it is rotated?

b. What is the magnitude of the average emf induced in the coil?

Explanation / Answer

flux =nB.A

as plane of each turn is parallel to the field.

flux =nBA = 5 x10-5 x 240 x 11 x10-4 =1.32 x10-5tesla

average emf =dflux/dt=nBA/2 = 0.66 x10-5T

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