Mutual Inductance

Consider two nearby coils. As a current changes in one coil, the magnetic flux through the other coil changes. This causes an induced emf (voltage) in the second coil.


We describe this situation as the mutual inductance of the two coils. The voltage induced in the other coil is


It turns out there is great symmetry and M = M12 = M21.

Energy in the Magnetic Field

LC Circuits

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(c) Doug Davis, 2002; all rights reserved