Two coils P and Q are kept near each other. When no current flows through coil P and current increases in coil Q at the rate 10 A/s, the emf in coil P is 12 mV. When coil Q carries no current and current of 1.5 A flows through coil P, the magnetic flux linked with the coil Q in mWb is (a) 0.9 (b) 1.2 (c) 1.5 (d) 1.8

Answer: (d). M = (eP)/(dIQ/dt) = 12× 10⁻³10 = 1.2× 10⁻³ H Same M both ways: ΦQ = M IP = 1.2× 10⁻³× 1.5 = 1.8× 10⁻³ Wb So the answer is (d) 1.8 mWb.

Two coils P and Q are kept near each other. When no current flows… | MHT CET 2025 (26 Apr, Shift 2)

Q17MHT CET 2025 · 26 APR · SHIFT 2Easy

Mutual Inductance

Two coils P and Q are kept near each other. When no current flows through coil P and current increases in coil Q at the rate $10\text{ A/s}$ , the emf in coil P is 12 mV. When coil Q carries no current and current of 1.5 A flows through coil P, the magnetic flux linked with the coil Q in mWb is

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Answer: (d)

$M = \dfrac{e_P}{dI_Q/dt} = \dfrac{12\times 10^{-3}}{10} = 1.2\times 10^{-3}$ H
Same $M$ both ways: $\Phi_Q = M I_P = 1.2\times 10^{-3}\times 1.5 = 1.8\times 10^{-3}$ Wb
So the answer is (d) 1.8 mWb.

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