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 magnet on one end. Which statement is correct about the energy stored in the magnetic field?
A). The decrease in the energy stored in the system is proportional to the increase in kinetic energy.
B). The increase in the energy stored in the system is proportional to the increase in kinetic energy.
C). The increase in the energy stored in the system is proportional to the decrease in kinetic energy.
D). The decrease in the energy stored in the system is proportional to the decrease in kinetic energy.
3 answers
D). The decrease in the energy stored in the system is proportional to the decrease in kinetic energy. When the two magnets attract and come together, the magnetic potential energy decreases as the distance between the magnets decreases. This energy is transformed into kinetic energy as the second magnet begins to spin around the first magnet. As the spinning slows down and eventually stops, the kinetic energy decreases, and this energy is transformed back into magnetic potential energy stored in the system. Therefore, the decrease in the energy stored in the system is proportional to the decrease in kinetic energy.
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