If power dissipated in the circuit is $150\,W,$ then value of $R$ is ............... $\Omega$
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$150 \mathrm{\,W}$ on two so $75 \mathrm{\,W}$ on one
$\therefore \frac{\mathrm{V}^{2}}{\mathrm{R}}=75 \Rightarrow \mathrm{R}=\frac{15 \times 15}{75}=3 \,\Omega$
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