Physics
Which of the following is an example of a magnetic keeper?
- Steel
- Nickel
- Soft iron
- Electromagnet
Magnetism
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Answer
Soft iron
Reason — A magnetic keeper is a piece of soft iron placed across the poles of a bar magnet when not in use and it helps to preserve the magnet’s strength by providing a closed path for the magnetic lines of force.
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Match the columns.
Column A Column B 1. Artificial magnets (a) Giant magnet 2. Poles (b) Strong magnets 3. Electromagnet (c) Maximum strength of magnet 4. Self-demagnetisation (d) Temporary magnet 5. Earth (e) Poles left free Give reasons for the following statements.
(a) Wood cannot be magnetised.
(b) Magnetite was later on called leading stone.
(c) Magnetic compass is based on one of magnet's properties.
(d) Magnetic induction is temporary.
(e) Magnets should be stored properly.