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Chapter 27: Problem 11

It takes work to push two bar magnets together with like poles facing. Where does this energy go?

Short Answer

Expert verified
The work done in pushing two like poles of magnets together against their repulsion is converted into and stored as potential energy in the magnetic field between the two magnets.

Step by step solution

01

Understanding the behavior of bar magnets

Similar poles of magnets repel each other. So when two bar magnets are being pushed together such that similar poles face each other, they resist this attempt because of the magnetic repulsion force. Therefore, work has to be done to overcome this repulsive force.
02

Identifying where the work goes

The work done on the magnets against the magnetic repulsion becomes stored as magnetic potential energy inside the magnetic field that exists between the two magnets. This stored potential energy will be released if the magnets are allowed to separate.
03

Applying the conservation of energy principle

According to the principle of conservation of energy, energy cannot be created or destroyed, but only changed from one form to another. In this case, the mechanical work done on the magnets is converted into potential energy in the magnetic field.

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