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Physics CBSE Live product
Class 8 (2026-27)
Electricity: Magnetic and Heating Effect
Electromagnet & Its Applications
3.
Working principle of electromagnet
Question:
4
m.
Select the best answer:
1
.
What is the effect when electric current passes through a coil in an electromagnet?
The coil becomes lighter in weight
The coil produces a magnetic field around it
The coil starts melting due to heat
The coil loses all its properties
2
.
Why does an electromagnet lose its magnetism when the current is switched off?
Because the coil becomes invisible
Because the wire gets damaged
Because the iron core melts
Because there is no magnetic field without electric current
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