Question 362: Electromagnetic Induction

Question

The induced emf in a coil of $$10 \mathrm{H}$$ inductance in which current varies from $$9 \mathrm{~A}$$ to $$4 \mathrm{~A}$$ in $$0.2 \mathrm{~s}$$ is

Accepted Answer

Included emf $$e=-L \frac{d i}{d t}$$
Given,
$$\begin{aligned}
L & =10 \mathrm{H}, \Delta \mathrm{i}=9-4=5 \mathrm{~A}, d t=0.2 \mathrm{~s} \
e & =10 	imes \frac{5}{0.2}=250 \mathrm{~V}
\end{aligned}$$

Answer

200 V

Answer

250 V

Answer

300 V

Answer

350 V

Electromagnetic Induction

The induced emf in a coil of $10 \mathrm{H} inductance in which current varies from 9 \mathrm{~A} to 4 \mathrm{~A} in 0.2 \mathrm{~s}$ is

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