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Physics CBSE Live product
Class 8 (2026-27)
Electricity: Magnetic and Heating Effect
Properties and Strength of Electromagnets
4.
Lifting electro magnet and Earth's magnetic field
Question:
3
m.
Choose the correct answer below:
1.
Lifting electromagnets are commonly used in factories and scrap yards mainly to
lift and move heavy metal objects
protect machines from rust
measure magnetic fields
generate electricity
2.
Why are lifting electromagnets preferred over permanent magnets in cranes?
Permanent magnets are too expensive
Electromagnets attract all materials
Electromagnets can be controlled using electric current
Permanent magnets lose strength quickly
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