問題詳情

39. A simple DC motor run by a 9.0 V batteryhas a 20 turn square coil with sides of length5.0 cm and total resistance of 24Ω (Fig. 5).When the motor spins, the magnetic field feltby the wire in the coil is

T. Which ofthe following values is closest to the themaximum torque on the motor in mㆍN?


(A)


(B)


(C)

 
(D)


(E)

                 

參考答案

答案:A
難度:計算中-1
書單:沒有書單,新增