Quotation from: General Science

Written by: Bertha M. Clark


A magnetic needle held under a current-bearing wire turns on its pivot
and finally comes to rest at an angle with the current. The fact that
the needle is deflected by the wire shows that the magnetic power of
the wire extends into the surrounding medium.


The magnetic properties of current electricity were discovered by
Oersted of Denmark less than a hundred years ago; but since that time
practically all important electrical machinery has been based upon one
or more of the magnetic properties of electricity. The motors which
drive our electric fans, our mills, and our trolley cars owe their
existence entirely to the magnetic action of current electricity.

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