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The inductive reactance of coil is $\mathrm{R}$. If the inductance of a coil is doubled and frequency of a.c. supply is also doubled then then new inductive reactance will
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$4 R$
Inductive reactance $=\mathrm{R}=2 \pi \mathrm{fL}$
If $\mathrm{L}$ and $\mathrm{f}$ both are doubled, the inductive reactance will become $4 R$
If $\mathrm{L}$ and $\mathrm{f}$ both are doubled, the inductive reactance will become $4 R$
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