In storing magnets, the keeper is used to
A
cancel the effect of the earth's magnetism
B
reduce self demagnetization
C
protect the magnet from stray electric field
D
increase the strength of the magnet.
Verified Correct Answer: B.
Physical Principles & Numerical Solution
Keepers reduce self-demagnetization of magnets by providing a low reluctance path for magnetic flux, thereby containing the flux within the keeper.
Source: WAEC / JAMB / NECO Classroom Archive (Record #72077)