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Question 20188
JEE Physics · Medium

Magnetism: Hysteresis Loop — Retentivity MCQ

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Hysteresis Loop — RetentivityMediumQuestion 20188

Question

Retentivity (or remanence) of a ferromagnetic material is:
  1. A
    Magnetic field strength needed to reduce B to zero
  2. B
    Residual magnetic flux density when H = 0
    Correct
  3. C
    Area under B-H curve
  4. D
    Maximum permeability

Correct answer

Residual magnetic flux density when H = 0

Explanation

When the magnetising field is removed (H = 0), the material retains a magnetic flux density equal to retentivity. Permanent magnets need high retentivity.

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