PH-1763
Induced magnetism
Physics · Secondary 4 · Medium · Induced magnetism
An electric doorbell uses an electromagnet to pull an iron armature when the switch is pressed and to release it when the switch is opened. Which material is most suitable for the core of this electromagnet?
- Soft iron, because it is easily magnetised and demagnetised
- Steel, because it keeps its magnetism permanently
- Brass, because it does not conduct electricity
- Plastic, because it is a strong non-magnetic material
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