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Question

Permanent magnets should have
  1. High retentivity and low coercivity.
  2. Low retentivity and high coercivity.
  3. Low retentivity and low coercivity.
  4. High retentivity and high coercivity.

A
Low retentivity and low coercivity.
B
High retentivity and low coercivity.
C
Low retentivity and high coercivity.
D
High retentivity and high coercivity.
Solution
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The correct option is C High retentivity and high coercivity.
Permanent magnets should have high retentivity so that a strong magnetic field persists on removal of magnetic field.
Permanent magnets should have high coercivity so that external magnetic field in opposite direction cannot easily demagnetize the magnet.

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