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The reactance of a coil when used in the domestic ac power supply ( $220 \mathrm{volt}, 50 \mathrm{cycles}$ ) is $100 \mathrm{ohm}$. The self inductance of the coil is nearly
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0.32 henry
$\begin{aligned} & \text { Reactance }=2 \pi v \Rightarrow 100 \Omega=2 \times \frac{22}{7} \times 50 \times L \\ & \therefore L=0.32 \text { henry }\end{aligned}$
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