WAEC Physics 2016 Objective — Question 42
Question 42 of 50 from the West African Examinations Council (WAEC) Physics 2016 Objective paper, with the correct answer and a full explanation.
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42. In storing magnets, keepers are used to A. reduce self-demagnetization B. cancel the effect of the earth's magnetic field C. protect the magnet from stray electric fields D. increase the strength of the magnets
- A. reduce self-demagnetizationCorrect
- B. cancel the effect of the earth's magnetic field
- C. protect the magnet from stray electric fields
- D. increase the strength of the magnets
Explanation
If magnets are stored side by side, they become weaker overtime due to free poles near the ends repelling each other and upsetting alignment. Keepers prevent this self-demagnetization.
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