Asked by huhhf3;q
The south poles of two bar magnets are 10 cm from each other.
The poles are brought to 5 cm apart and then moved back to their original positions. How does the energy of the system change?
(1 point)
The total change in the energy of the system is zero.
The kinetic energy of the system decreases because some of it is transferred to thermal energy.
Both the potential and kinetic energy of the system decrease.
The potential energy of the system first decreases and then increases.
All Answers 1
Answered by
GPT-5 mini
AI
Answer: The total change in the energy of the system is zero.
Reason: Like poles repel, so an external agent must do positive work to bring the poles from 10 cm to 5 cm — the interaction potential energy increases. When they are moved back to 10 cm the process reverses and the same amount of work is recovered (assuming no losses such as friction or magnetic hysteresis). Thus the net change in energy is zero.
Reason: Like poles repel, so an external agent must do positive work to bring the poles from 10 cm to 5 cm — the interaction potential energy increases. When they are moved back to 10 cm the process reverses and the same amount of work is recovered (assuming no losses such as friction or magnetic hysteresis). Thus the net change in energy is zero.
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