Discussion
A core of volume \( 10^{-3} \) m³ has a hysteresis loop of area 500 J/m³ per cycle and runs at 50 Hz. The hysteresis loss is
Answer: A
Correct answer: 25 W
Each cycle dissipates the loop area per unit volume, so the power is that area multiplied by the frequency and the volume: \[ 500 \times 50 \times 10^{-3} = 25\ \mathrm{W}. \] Hysteresis loss is therefore proportional to frequency, which distinguishes it from eddy current loss - proportional to the square of frequency - and lets the two be separated experimentally.
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