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Question 20189
JEE Physics · Medium

Magnetism: Hysteresis Loop — Coercivity MCQ

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Hysteresis Loop — CoercivityMediumQuestion 20189

Question

Coercivity of a ferromagnetic material is:
  1. A
    Flux density when H = 0
  2. B
    Reverse field needed to reduce B to zero (demagnetise)
    Correct
  3. C
    Area of the B-H loop
  4. D
    Saturation magnetisation

Correct answer

Reverse field needed to reduce B to zero (demagnetise)

Explanation

Coercivity is the magnitude of reverse H required to bring B to zero after saturation. Permanent magnet materials need high coercivity so they aren't easily demagnetised.

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