在电磁学中讲过洛仑兹力对运动电荷不作功,但是作用到带流导体上的安培力却作功,动生电动势也是由洛仑兹力作功引起的,这些说法前后是否矛盾?本文想就洛仑兹力在电能与机械能相互转换中的作用加以论述,借以论证上述说法的含意。 In electromagnetism, it was said that Lorentz force does not contribute to the motion charge, but the Ampere force acting on the current-carrying conductor does work, and the electromotive force is also caused by the Lorentz force. Are these arguments contradictory? I want to discuss the role of Lorentz force in the conversion of electrical energy and mechanical energy, so as to demonstrate the meaning of the above statement.