# 物理的英文題目

the rotor ina certain electric motor is a flat, rectangular

coil with 80turns of wire and dimensions 2.50 cm by 4.00 cm.

The rotor rotates in a uniform magnetic field of 0.800T.Whem

the plane of the rotor is perpendicular to the direction of

the magnetic field, it carries a current of 10.0mA. In this

orientation, the mafnetic moment of the rotor is directed opposite

the magnetic field. The rotor then turns through one-half revolution.

This process is repeated to cause the rotor to turn steadily at 3600 rev/min

(a)Find the maximum torque acting on the rotor.

(b)Find the peak power output of the motor.

(c)Determine the amount of work performed by the magnetic field on the rotor in

ever full revolution.

(d)What is the average power of the motor?

Rating

伊納某些轉子電機是一個平面，矩形

線圈80圈鋼絲和層面二點五○厘米的四點○○厘米。

轉子的旋轉，在均勻磁場的0.800T 。當飛機的旋翼垂直的方向

磁場，它帶有電流十點零毫安。在這

方向，磁矩轉子是針對對面

磁場。轉子然後輪流通過一半的革命。

這個過程重複造成轉子將穩步上升， 3600轉/分

（一）尋找代理的最大扭矩的轉子。

（二）查找峰值輸出功率的電動機。

（ c ）確定的工作由磁場對轉子

以往任何時候都充分的革命。

（四）什麼是平均功耗電動機？