AP EAMCET · PHYSICS · Electromagnetic Induction
The magnitude of the induced emf in a coil of inductance \(30 \mathrm{mH}\) in which the current changes from \(6 \mathrm{~A}\) to \(2 \mathrm{~A}\) in 2 \(\mathrm{s}\) is
- A \(0.06\ V\)
- B \(0.6\ V\)
- C \(1.06\ V\)
- D \(6\ V\)
Answer & Solution
Correct Answer
(A) \(0.06\ V\)
Step-by-step Solution
Detailed explanation
\(\begin{aligned} & \text { } e=-L \frac{d l}{d t} \Rightarrow e=-30 \times 10^{-3} \times\left(\frac{2-6}{2}\right) \\ & =+30 \times 10^{-3} \times \frac{4}{2}=+0.06 \mathrm{~V}\end{aligned}\)
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