When an object is attracted by a magnet, a work is done on it by the magnetic energy as the displacement of the object is in the direction of the force applied. According to work energy theorem, when work is done, energy applied should decrease. Yet magnetic energy never decreases. Why is this not a violation of the law of conservation of energy?

Asked by  | 13th Jun, 2011, 12:00: AM

Expert Answer:

No, it is not a violation of the law of conservation of energy.
According to work energy theorem, when an object is in motion, the work done is equal to the change in kinetic energy and applied energy need not necessarily decrease.
When an object is attracted by a magnet, a part of magnetic energy is used to diplace the object as such the magnetic energy changes into kinetic energy; hence change in the form of energy is seen which is not a violation of law of consrvation of energy.

Answered by  | 13th Jun, 2011, 10:59: AM

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