PHY2061 R. D. Field Department of Physics chp36_1.doc University of Florida Mutual & Self Inductance Mutual Inductance (M): Consider two fixed coilswith a varying current I1in coil 1producing a magnetic field B1. The induced EMFin coil 2due to B1is proportional to the magnetic flux through coil 2, Φ212222=⋅=∫rrBdA Ncoilφ, where N2is the number of loops in coil 2and φ2is the flux through a single loop in coil 2. However, we know that B1is proportional to I1which means that Φ2is proportional to I1. The mutual inductance Mis defined to be the constant of proportionality betweenΦ2and I1and depends on the geometry of the situation, MININMI====ΦΦ21121. The induced EMFin coil 2due to the varying current in coil 1is given by,
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