A motor run by a 7.3 V battery has a 23 turn square coil with sides of length 4.

Question

A motor run by a 7.3 V battery has a 23 turn square coil with sides of length 4.0 cm and total resistance 34 . When spinning, the magnetic field felt by the wire in the coil is 1.6×102 T .

Part A

What is the maximum torque on the motor?

Express your answer using two significant figures.

A motor run by a 7.3 V battery has a 23 turn square coil with sides of length 4.0 cm and total resistance 34 . When spinning, the magnetic field felt by the wire in the coil is 1.6×102 T .

Part A

What is the maximum torque on the motor?

Express your answer using two significant figures.

Explanation / Answer

a = 4.0 cm = 0.04 m

Magnetic Moment = IAN

I = V/R = 7.3 / 34 = 0.215 A

A = a2 = (0.04 )2 = 0.0016 m2

N = 23

so = (0.215) * (0.0016) * (23) = 0.007912 Am2

Torque = * B = 0.007912 * 1.6 * 10-2

= 12.66 * 10-5 Nm

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