A temporary lifting electromagnet can be fitted with either a soft-iron core ( ) or a…

PHYSICS · Subjective · CBSE · Physics · Magnetism and Matter · Magnetism and Matter

Problem

A temporary lifting electromagnet can be fitted with either a soft-iron core (Hc=60 A/mH_c = 60\,\text{A/m}) or a hard ferrite core (Hc=400 A/mH_c = 400\,\text{A/m}). The coil will generate a peak magnetic field strength of H=250 A/mH = 250\,\text{A/m} before the current is turned off. Justify which core material should be chosen to minimize any residual magnetization after the device is switched off, and explain your reasoning.

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