An iron bar can be made magnetic by wrapping wire around it and passing an electric current through the wire.

可以通过在铁棒上缠绕电线并通电的方法使其具有磁性。

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An iron bar can be made magnetic by wrapping wire around it and passing an electric current through the wire.

可以通过在铁棒上缠绕电线并通电的方法使其具有磁性。

youdao