Question #171581

Two coils A and B are wound on same iron core. There are 500 turns on coil A and 3000 turns on coil B. A current of 5A through coil A produces a flux of 600x10 wb in core. If

this current is reversed in 0.02sec, claculate average e.m.f. Induced in coils A and B.

Expert's answer

**In coil B**

"E_i=|\\frac{\\Delta\\Phi}{\\Delta t}|"

"\\Phi=N_A\\cdot\\Phi_0\\to \\Phi_0=\\Phi\/N_A=6000\/500=12\\ Wb"

"\\Phi_B=N_B\\cdot \\Phi_0=12\\cdot3000=36000\\ (Wb)"

"E_B=2\\cdot\\Phi_B\/\\Delta t=2\\cdot36000\/0.02=3.6\\cdot10^6\\ (V)"

**In coil A**

"E_A=2\\cdot\\Phi_A\/\\Delta t=2\\cdot6000\/0.02=6\\cdot10^5\\ (V)"

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