In a coil, the current changes from $-2 \mathrm{~A}$ to $+2 \mathrm{~A}$ in $0.2 \mathrm{~s}$ and induces an emf of $0.1 \mathrm{~V}$. The self inductance of the coil is :

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Aicharya · Accepted Answer

$(E m f)_{	ext {induced }}=-L \frac{d i}{d t}$ In magnitude form, $\begin{aligned} & \left|\operatorname{Emf}_{	ext {ind }}ight|=\left|(-) L \frac{\mathrm{di}}{\mathrm{dt}}ight| \ & \Rightarrow 0.1=\frac{(\mathrm{L})[+2-(-2)]}{0.2} \ & \Rightarrow \mathrm{L}=\frac{0.1 	imes 0.2}{4}=5 \mathrm{mH} \end{aligned}$

In a coil, the current changes from $-2 \mathrm{~A}$ to $+2 \mathrm{~A}$ in $0.2 \mathrm{~s}$ and induces an…

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