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Physics CBSE Live product
Class 8 (2025-26)
Electricity: Magnetic and heating effects
Revision I - Electricity: Magnetic and heating effects
7.
Properties of electromagnets
Question:
4
m.
Choose the correct answer:
1.
Electromagnet
-
A temporary magnet formed when electric current flows through a coil wound around a soft iron core
A permanent magnet formed when electric current flows through a coil wound around a hard iron core
A temporary magnet formed when electric current flows through a coil wound around a hard iron core
A permanent magnet formed when electric current flows through a coil wound around a soft iron core
2.
Temporary magnetism
-
Magnetism that exists even after current is switched off
Magnetism that exists only while electric current flows
Magnetism that exists only while electric current does not flow
Magnetism that does not exist even after current is switched on
3.
Strength of an electromagnet
-
The intensity of the magnetic field produced by the electromagnet
The area of the magnetic field produced by the electromagnet
The intensity of the magnetic field produced by the coil
The length of the magnetic field produced by the electromagnet
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