A circular loop in the plane of a paper lies in a 0.85 T magnetic field pointing

Question

A circular loop in the plane of a paper lies in a 0.85 T magnetic field pointing into the paper. The loop's diameter changes from 19.5 cm to 6.6 cm in 0.55 s .

Part A

What is the direction of the induced current?

B: clockwise

Part B

What is the magnitude of the average induced emf?

Express your answer to two significant figures and include the appropriate units.

Part C

What is the average induced current if the coil resistance is 4.7 ?

Express your answer to two significant figures and include the appropriate units.

B: clockwise

Part B

What is the magnitude of the average induced emf?

Express your answer to two significant figures and include the appropriate units.

Part C

What is the average induced current if the coil resistance is 4.7 ?

Express your answer to two significant figures and include the appropriate units.

Explanation / Answer

According to the given problem,

a) Anticlockwise

b) V = dø / dt = 0.85 *( * 0.09752 – * 0.0332 ) / 0.55 = 0.04086 = 0.041 V

c) I = V / R = 0.041 / 4.7 = 8.7*10-3 A

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