Question

Permanent magnets should have

• A. High retentivity and low coercivity.
• B. Low retentivity and high coercivity.
• C. High retentivity and high coercivity.
• D. Low retentivity and low coercivity.

Answer 1

Answer: (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.