A direct current passing through a wire coiled around a soft iron core is the description of a simple（）.<br>A:magnetic shield<br>B:electromagnet<br>C:piezoelectric device<br>D:electromagnetic domain

A direct current passing through a wire coiled around a soft iron core is the description of a simple（）.
A:magnetic shield
B:electromagnet
C:piezoelectric device
D:electromagnetic domain

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