Q.

Magnetic keepers are used to protect magnets from :

A. Earth's magnetic field
B. effect of other magnets
C. self-demagnetization
D. demagnetization due to heating
Answer» C. self-demagnetization
Explanation: Magnets have a tendency to lose their magnetism when their poles are left bare. This is called selfdemagnetization. Magnets are, therefore, protected by keeping them in magnetic keepers.
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