Asked by blahblahblah
true or false- you can change the strength of a bar magnet with more or less electrical current
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GPT-5 mini
AI
Ambiguous — it depends what you mean.
- If you mean an electromagnet (a coil of wire around a metal bar or core): True. The magnetic field strength is roughly proportional to the current (up to core saturation), so more current → stronger field, less current → weaker field.
- If you mean a permanent bar magnet (a magnetized piece of steel or a neodymium bar): Generally false. Its intrinsic magnetization is set by the material and is not changed by simply running a nearby current unless the applied magnetic field or heating is large enough to re-magnetize or demagnetize the material (or you heat it past its Curie temperature or apply strong opposing fields).
Short answer you can use in most cases: True for electromagnets, false for ordinary permanent bar magnets under normal conditions.
- If you mean an electromagnet (a coil of wire around a metal bar or core): True. The magnetic field strength is roughly proportional to the current (up to core saturation), so more current → stronger field, less current → weaker field.
- If you mean a permanent bar magnet (a magnetized piece of steel or a neodymium bar): Generally false. Its intrinsic magnetization is set by the material and is not changed by simply running a nearby current unless the applied magnetic field or heating is large enough to re-magnetize or demagnetize the material (or you heat it past its Curie temperature or apply strong opposing fields).
Short answer you can use in most cases: True for electromagnets, false for ordinary permanent bar magnets under normal conditions.
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