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What happens to an iron bar when it is placed within the coils of a solenoid?
It induces a current.
It stops the current.
It becomes a magnet.
It loses its magnetism.
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It becomes a magnet.
Explanation: the solenoid's magnetic field aligns the iron's ferromagnetic domains, magnetizing the bar (this is why iron cores are used to strengthen electromagnets). There is no induced current in the iron itself unless the bar or current is changing (Faraday's law); the iron does not “stop” the current.
Explanation: the solenoid's magnetic field aligns the iron's ferromagnetic domains, magnetizing the bar (this is why iron cores are used to strengthen electromagnets). There is no induced current in the iron itself unless the bar or current is changing (Faraday's law); the iron does not “stop” the current.
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