Exercise 29.2 Part A In a physics laboratory experiment, a coil with 170 turns e

Question

Exercise 29.2 Part A In a physics laboratory experiment, a coil with 170 turns enclosing an area of 13.5 cm2 is rotated in a time interval of 4.70x102 s 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 earth's magnetic field at the lab location is 6.4*10-5T What is the total magnetic flux through the coil before it is rotated? Express your answer using two significant figures at the lab location is 6.4x105 T Wb Submit My Answers Give Up Part B What is the total magnetic flux through the coil after it is rotated? Express your answer using two significant figures 2 Submit My Answers Give Up

Explanation / Answer

Given

N = 170 turns

area A = 13.5 * 10^-4 m^2

t = 4.7 * 10^-2 s

B1 = 6.4 * 10^-5 T

part A

phi1 = B * A * cos(theta)

phi1 = 6.4 * 10^-5 * 13.5 * 10^-4 * cos(0)

phi1 = 86.4 * 10^-9 Wb

part B

phi2 = B * A * cos(theta)

phi2 = 6.4 * 10^-5 * 13.5 * 10^-4 * cos(90)

phi2 = 0 Wb

part C

indiced emf   e = - N * dphi / dt

e = - N * (phi2 - phi1)/t

e = 170 * (86.4 * 10^-9) / 4.7 * 10^-2

e = 3.12 * 10^-4 V

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