Mutual Inductance in Coils
These coils can induce emfs in one another like an inefficient transformer. Their mutual inductance M indicates the effectiveness of the coupling between them. Here a change in current in coil 1 is seen to induce an emf in coil 2. (Note that "E2 induced" represents the induced emf in coil 2. )
Source
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"OpenStax College, College Physics. January 8, 2013."
http://cnx.org/content/m42420/latest/?collection=col11406/1.7
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