Physics

Problem

A soft iron core inside an electromagnet experiences an internal magnetic field of

0.60\,\text{T}

while the coil is energized. Immediately after the current is switched off, the field inside the core drops to

0.06\,\text{T}

. Approximately what percentage of the core’s original magnetization remains after the external field is removed? a) 6\% b) 10\% c) 90\% d) 1\%