Physics · Magnetic Properties
Hard ferromagnetic materials are highly appropriate for making permanent magnets primarily because:
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- 1Their mechanical strength is exceptionally low.
- 2They have zero magnetic coercivity.
- 3They are easily demagnetized by external fields.
- 4Their hysteresis loop has a large area with high retentivity and coercivity.✓
Correct answer
Their hysteresis loop has a large area with high retentivity and coercivity.
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