Rowland's Ring — HysteresisHardQuestion 20227
Question
The area enclosed by the B-H hysteresis loop represents:
- ARetentivity of the material
- BCoercivity of the material
- CEnergy dissipated per unit volume per cycleCorrect
- DSaturation magnetisation
Correct answer
Energy dissipated per unit volume per cycle
Explanation
∮H·dB = energy per unit volume per cycle lost as heat in the magnetic material. Materials for transformer cores need small hysteresis loops (low loss); permanent magnets need large loops.