Lifting electro magnet and Earth's magnetic field — task. Physics CBSE Live product, Class 8 (2026-27).

Choose the best answer:

1. The Earth behaves like a giant magnet because of

electric charges in the atmosphere
gravity acting on the core
permanent magnets inside rocks
movement of molten iron inside the Earth

2. Why are lifting electromagnets preferred over permanent magnets in cranes?

Permanent magnets lose strength quickly
Permanent magnets are too expensive
Electromagnets attract all materials
Electromagnets can be controlled using electric current

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