针对动生电动势等于洛仑兹力所作的功的问题，定量证明在动生电动势中洛仑兹力并不作功，并得出洛仑兹力永不作功的结论．。
To answer the question whether Lorentz force does work or not in the case of electromotive force, it is proved that Lorentz force does no work in electromotive force.
对于约束运动中的功和能，目前均采用具体分析和计算约束力所作功的方法来处理。
At present work and energy in confined motion are treated with the method of work done by confined force which is analysed and calculated.
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