Exams › SSC CGL (Prelims) › General

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

1. Electric Motor : Converts electrical energy into electrical energy
2. Transformer : Operates only on direct current (DC)
3. Electromagnet : Loses its magnetism when the current is switched off
4. Electric Fuse : Works on the magnetic effect of electric current

Correct answer: Electromagnet : Loses its magnetism when the current is switched off

Solution

An electromagnet is magnetic only while current passes through its coil and loses magnetism once the current stops, so that pair is correct. A motor converts electrical to mechanical energy, transformers work on AC, and a fuse uses the heating effect, so those pairs are wrong.

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