Which of the following pairs is correctly matched regarding electromagnetic devices?

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Accepted Answer

1. **Motor:** A motor converts electrical energy into mechanical energy, so (a) is wrong.
2. **Transformer:** A transformer needs $AC$ and does not work with $DC$, so (b) is wrong.
3. **Electromagnet:** It is magnetic only when current flows. It loses magnetism when the current is switched off, so (c) is correct.
4. **Fuse:** A fuse melts from heat caused by current (thermal effect), not by the magnetic effect, so (d) is wrong.

FINAL_ANSWER: c

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