Permanent magnet has properties retentivity and coercivity respectively

Question

Permanent magnet has properties retentivity and coercivity respectively (A) high-high (B) low-low (C) low-high (D) high-low

Tardigrade Admin · Accepted Answer

The materials for a permanent magnet should have high retentivity (so that the magnet is strong) and high coercivity (so that the magnetism is not wiped out by stray magnetic fields). As the material in this case is never put to cyclic changes of magnetisation, hence hysteresis is immaterial.

Q. Permanent magnet has properties retentivity and coercivity respectively

high-high

low-low

low-high

high-low

The materials for a permanent magnet should have high retentivity (so that the magnet is strong) and high coercivity (so that the magnetism is not wiped out by stray magnetic fields). As the material in this case is never put to cyclic changes of magnetisation, hence hysteresis is immaterial.