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What kind of force does a magnetic field exert
on a charge? on a current in a wire? on charges
in a wire when the wire is moved through the
magnetic field?
What is the nature of the sources of magnetic
fields?
磁场的来源是什么？
How can a moving magnet generate a voltage
in a coil of wire?
如何使磁体在电线圈中产生电压？
How can a magnetic field generate a voltage
in a moving wire?
磁场如何在运动的导线中产生电压？
What kind of force does a magnetic field exert
on a charge? on a current in a wire? on charges
in a wire when the wire is moved through the
magnetic field?
磁场对电荷施加什么类型的力？对导线中的电流施加什么类型的力？当导线通过磁场运动时，对导线中的电荷施加什么类型的力？
How is electric voltage generated in an electric generator?
电动势是如何在发电机中产生的？
How is the force which turns an electric motor produced?
电动机的力是如何产生的？
What useful tasks can be accomplished by a
transformer? What are the limitations on the
power output of a transformer?
变压器能完成哪些有用的任务？变压器的功率输出有哪些限制？
磁场对电荷施加什么类型的力？对导线中的电流施加什么类型的力？当导线通过磁场运动时，对导线中的电荷施加什么类型的力？ |