A bar magnet is held in place while another bar magnet is placed near it. The second bar magnet spins around and attaches to the first magnetic on one end, which statement is correct about the energy stored in the magnetic field?

Question

The increase in the energy stored in the system is proportional to increase kinetic energy.
The decrease in energy stored in the system is proportional to the increase in kinetic energy.
The increase in the energy stored in the system is proportional to the decrease in kinetic energy.
The Decrease in the energy stored in the system is proportional to decrease in kinetic energy

Answer 1

. The increase in the energy stored in the system is proportional to the decrease in kinetic energy.

As the second bar magnet spins and attaches to the first magnet, energy is transferred from the kinetic energy of the spinning motion to the magnetic field energy between the two magnets. This results in an increase in the energy stored in the magnetic field.