In a physics laboratory experiment, a coil with 150 turns. Each turn of the col

Question

In a physics laboratory experiment, a coil with 150 turns. Each turn of the col encloses an area of 9.0 cm^3. The cod 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 times 10^-2 s. The earth's magnetic field at the location of the laboratory is 6.0 times 10^-5 T What is the magnetic flux through one turn of the coil after it is rotates? What is the average emf induced in the coil as it is rotated from the perpendicular to the parallel orientation?

Explanation / Answer

Given N = 150

area A = 9 cm^2 = 9 * 10^-4 m^2

magnetic field B = 6 * 10^-5 T

angle rotated to through 90

so

a) change in magnetic flux = N * B * A * sin(theta)

change in magnetic flux = 150 * 6 * 10^-5 * 9 * 10^-4 * sin(90)

phi = 8.1 * 10^-6 webre

b)

induced emf e = phi / t

e = 8.1 * 10^-6 / (3 * 10^-2)

e = 2.7 * 10^-4 V

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