Coercive force is the force which opposes ____________________?
Correct answer: A. Demagnetization
- A. Demagnetization
- B. Breakage
- C. Extension
- D. Surface cracking
Explanation
Coercive force is the reverse magnetic field required to reduce the magnetisation of a magnet to zero, so it opposes demagnetisation. The likely mistake is choosing breakage, because “coercive” sounds like resisting physical damage rather than reversing magnetisation.
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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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