39. A simple DC motor run by a 9.0 V battery has a 20 turn square coil with sides of length 5.0 cm and total resistance of 24Ω (Fig. 5). When the motor spins, the magnetic field felt by the wire in the coil is T. Which of the following values is closest to the the maximum torque on the motor in mㆍN?
(A)
(B)
(C)  
(D)
(E)                 

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統計： A(5), B(1), C(0), D(1), E(1) #2993338

詳解 (共 1 筆)

#7295246
Γ (torque)= N x I x A x B
=20 x 9/24 x (5x10-2 )2 x 2 x 10-2
=3.75 x 10-4
0
0