There are 10 turns in coil M and 15 turns in coil N. If a current of 2A is passed through coil M then the flux linked with coil N is 1.8 × 10⁻³ Wb. If a current of 3A is passed through coil N then flux linked with coil M is :-
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Question

There are 10 turns in coil M and 15 turns in coil N. If a current of 2A is passed through coil M then the flux linked with coil N is 1.8 × 10⁻³ Wb. If a current of 3A is passed through coil N then flux linked with coil M is :-

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G1 Physics · Accepted Answer

Magnetic flux is Φ=∫B⃗·dA⃗ and induced emf is ε=−dΦ/dt. Apply Lenz’s law for direction and I=ε/R when the circuit is resistive. This gives 2.7 × 10⁻³ Wb.