COMEDK · Physics · 22. Electromagnetic Induction
The current in a coil changes steadily from \(3 \mathrm{~A}\) to \(5 \mathrm{~A}\) in \(0.2 \mathrm{~s}\) when an emf of \(2 \mu \mathrm{V}\) is induced in it. The self-inductance of the coil is
- A 2 \(\mu H\)
- B 0.2 mH
- C 0.2 \(\mu H\)
- D 20 \(\mu H\)
Answer & Solution
Correct Answer
(C) 0.2 \(\mu H\)
Step-by-step Solution
Detailed explanation
The induced emf \(\varepsilon\) in a coil due to a change in current is given by the formula \(\varepsilon = L \left| \dfrac{di}{dt} \right|\), where \(L\) is the self-inductance of the coil. Given values are: Change in current…
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