COMEDK · Physics · 22. Electromagnetic Induction

The current in a coil changes from \(1 \mathrm{~mA}\) to \(5 \mathrm{~mA}\) in \(4 \mathrm{milli}\) secon(d) If the coefficient of self-induction of the coil is \(10 \mathrm{mH}\), then the magnitude of the self-induced emf is

A \(10 \mathrm{mV}\)
B \(5 \mathrm{mV}\)
C \(2.5 \mathrm{mV}\)
D \(1 \mathrm{mV}\)

Verified Solution

Answer & Solution

Correct Answer

(A) \(10 \mathrm{mV}\)

Step-by-step Solution

Detailed explanation

Given, \(\quad I_{1}=1 \mathrm{~mA}=1 \times 10^{-3} \mathrm{~A}\) \(I_{2}=5 \mathrm{~mA}=5 \times 10^{-3} \mathrm{~A}\) \(t=4 \mathrm{~ms}=4 \times 10^{-3} \mathrm{~s}\) \(L=10 \mathrm{~m} \mathrm{H}=10 \times 10^{-3} \mathrm{H}\) \(\therefore\) Self-induced emf,…

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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