ch30-p075 - 75. (a) We assume the current is changing at...

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which is exactly the emf that would be produced if the coils were replaced by a single coil with inductance L eq = L 1 + L 2 + 2 M . (b) We imagine reversing the leads of coil 2 so the current enters at the back of coil rather than the front (as pictured in the diagram). Then the field produced by coil 2 at the site of coil 1 is opposite to the field produced by coil 1 itself. The fluxes have opposite signs. An increasing current in coil 1 tends to increase the flux in that coil, but an increasing current in coil 2 tends to decrease it. The emf across coil 1 is ε 11 =− LM di dt bg . Similarly, the emf across coil 2 is 22 di dt The total emf across both coils is + LL M di dt 12 2 This the same as the emf that would be produced by a single coil with inductance
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This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.

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