For the core of a transformer operating under repeated alternating magnetisation, the preferred magnetic material should have:
Options

Question

For the core of a transformer operating under repeated alternating magnetisation, the preferred magnetic material should have:

G1 Physics · Accepted Answer

A transformer core is magnetised and demagnetised repeatedly. Therefore it should be a soft magnetic material with: • high permeability, so a large magnetic flux is obtained for modest H; • small coercivity, so magnetisation reverses easily; • a narrow hysteresis loop, so hysteresis energy loss is small. Hence option B is correct.