In a physics laboratory experiment, a coil with 160 turns enclosing an area of 1

Question

In a physics laboratory experiment, a coil with 160 turns enclosing an area of 10.6 cm2 is rotated during the time interval 3.30×10?2 s from a position in which its plane is perpendicular to Earth's magnetic field to one in which its plane is parallel to the field. The magnitude of Earth's magnetic field at the lab location is 6.20×10?5 T .

Part A

What is the magnitude of the magnetic flux (?initial) through the coil before it is rotated?

Express your answer numerically, in webers, to at least three significant figures.

Part B

What is the magnitude of the magnetic flux ?final through the coil after it is rotated?

Express your answer numerically, in webers, to at least three significant figures.

Part C

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

Express your answer numerically, in volts, to at least three significant figures.

Explanation / Answer

1. ?=A(B)N

2. 0

3. emf =?N(??/?t)

where ?? is the total change in magnetic flux through each loop, N is the total number of loops, and ?t is the time interval over which this change occurs

So we have:

1) ? = (160)(6.2*10^-5)(10.6*10^-4 m2)

= 1.05152 x 10-5 Wb

2) ? = 0

3) emf = (160)( 1.05152 x 10-5)/(3.3*10^-2)

= 0.05098 V

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