TS EAMCET · Physics · Electromagnetic Induction
In a pair of adjacent coils if the current in one coil changes from \(10 \mathrm{~A}\) to \(2 \mathrm{~A}\) in a time \(0.2 \mathrm{~s}\), an emf of \(120 \mathrm{~V}\) is induced in another coil. The mutual inductance of the pair of the coils is
- A \(2H\)
- B \(3H\)
- C \(6H\)
- D \(9H\)
Answer & Solution
Correct Answer
(B) \(3H\)
Step-by-step Solution
Detailed explanation
Emf is related to mutual inductance \(\begin{aligned} & \varepsilon=\mathrm{M} \frac{\mathrm{dI}}{\mathrm{dt}} \\ & \Rightarrow 120=\mathrm{M} \times \frac{10-2}{0.2} \end{aligned}\) Mutual inductance, \(\mathrm{M}=\frac{120 \times 0.2}{8}=3 \mathrm{H}\)
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