- #1

James Holtum

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Two coils, A and B, are wound on the same ferromagnetic core. There are 800 turns on A and 2800 turns on B. A current of 4 A through coil A produces a flux of 1500 μWb in the core. If this current is reversed in 30 ms, calculate the average EMFs induced in coils A and B.

**Relevant equations**

M=N2*(Flux2)/I1=N1*(Flux1)/I2

So for I've calculated M to be 1.05 mH and L to be 0.3 (not sure what units) but I don't think its right!