You are watching: Why must soft iron be used with an electromagnet
Electromagnets space a various from permanent magnets. Electromagnets space made the coils of wire with electrical energy passing through them. Moving charges develop magnetic fields, so as soon as the coils of wire in an electromagnet have an electric current passing v them, the coils behave favor a magnet.
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When the electricity stops flowing, the coils nothing act choose a magnet anymore. Electromagnets are offered in a the majority of electronic gadgets when magnetic pressures are only essential for brief periods the time.