In a physics laboratory experiment, a coil with 250 turns enclosing an area of 1

Question

In a physics laboratory experiment, a coil with 250 turns enclosing an area of 11.8 cm^2 is rotated in a time interval of 4.00 times 10^-2 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 times 10^-5T. What is the total magnetic flux through the coil before it is rotated? Express your answer using two significant figures. What is the total magnetic flux through the coil after it is rotated? Express your answer using two significant figures. What is the average emf induced in the coil? Express your answer using two significant figures.

Explanation / Answer

Here ,

N = 250

A = 11.8 cm^2

t = 0.04 s

B = 6.4 *10^-5 T

part A)

total magnetic flux through the coil = N * B * Area

total magnetic flux through the coil = 250 * 6.4 *10^-5 * 11.8 *10^-4

total magnetic flux through the coil = 1.89 *10^-5 T.m^2

part B)

after the coil is rotated ,

total magnetic flux through the coil = 0

as the coil is parallel to magnetic field

part C)

induced emf = change in flux/time

induced emf = (1.89 *10^-5)/.04

induced emf = 4.73 *10^-4 V

the induced emf is 4.73 *10^-4 V

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