Problem 26.55 A simple electric motor consists of a 220-turn coil, 4.7 cm in dia

Question

Problem 26.55

A simple electric motor consists of a 220-turn coil, 4.7 cm in diameter, mounted between the poles of a magnet that produces a 98-mT field.

Part A

When a 15-A current flows in the coil, what is the coil's magnetic dipole moment?

Express your answer with the appropriate units.

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Part B

When a 15-A current flows in the coil, what is the motor's maximum torque?

Express your answer with the appropriate units.

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Problem 26.55

A simple electric motor consists of a 220-turn coil, 4.7 cm in diameter, mounted between the poles of a magnet that produces a 98-mT field.

Part A

When a 15-A current flows in the coil, what is the coil's magnetic dipole moment?

Express your answer with the appropriate units.

=

SubmitMy AnswersGive Up

Part B

When a 15-A current flows in the coil, what is the motor's maximum torque?

Express your answer with the appropriate units.

max =

SubmitMy AnswersGive Up

Explanation / Answer

A) Dipole moment = n I A where A = pi (d/2)^2

= 220 x 15 x (pi x (4.7/2 x 10^-2)^2)

= 5.73

B) torque = moemnt x B

= 5.73 x 98 x 10^-3   

= 0.561 Nm

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