We say that work done by magnetic field is zero. But when a dipole is placed at an angle to the magnetic dipole, it is rotated in the direction of magnetic field.

Suppose the magnet was at rest. Now when it moves it gains kinetic energy. Now change in kinetic energy=work done.Therefore some work is done in moving the magnet. Who does this work if the work done by magnetic field is zero?

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We say that work done by magnetic field is zero. But when a dipole is placed at an angle to the magnetic dipole, it is rotated in the direction of magnetic field.

Suppose the magnet was at rest. Now when it moves it gains kinetic energy. Now change in kinetic energy=work done.Therefore some work is done in moving the magnet. Who does this work if the work done by magnetic field is zero?

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ROSHAN MUJEEB · Answer

see magnetic force does not do a net work on the whole system. the loss in potential energy is equal to the gain in kinetic energy here

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