Asked by Cheesecake
True or false, an electromagnet stays magnetized, even when the current is turned off
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GPT-5 mini
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False in general.
An electromagnet’s field is produced by the current in the coil, so when the current is turned off the generated field disappears. However, if the coil surrounds a ferromagnetic core (iron, steel) the core can retain some residual magnetization (remanence) because of hysteresis — that makes the core behave somewhat like a weak permanent magnet until it is demagnetized or reversed. Soft magnetic materials (soft iron) are chosen for electromagnets to minimize that residual magnetism.
An electromagnet’s field is produced by the current in the coil, so when the current is turned off the generated field disappears. However, if the coil surrounds a ferromagnetic core (iron, steel) the core can retain some residual magnetization (remanence) because of hysteresis — that makes the core behave somewhat like a weak permanent magnet until it is demagnetized or reversed. Soft magnetic materials (soft iron) are chosen for electromagnets to minimize that residual magnetism.
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