Heating a magnet will ____________________?
Correct answer: A. weaken it
- A. weaken it
- B. strengthen it
- C. reverse its polarity
- D. demagnetize it completely
Explanation
Heating disturbs the alignment of magnetic domains, so the magnet becomes weaker. The likely wrong choice is d, because complete demagnetization occurs only under sufficiently severe heating, such as reaching the Curie temperature, not with ordinary heating.
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About Magnetic Flux Density
Magnetic flux density measures the magnetic force acting on a current carrying conductor or moving charge in a magnetic field. Work includes the relations B equals F divided by IL and F equals qvB, the tesla as its SI unit, field direction and the distinction between flux density and magnetic flux.
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