By which of the following single load resistance the load bridge should be replaced so that the power to the load remains unchanged ................ $\Omega$
Diffcult
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$\mathrm{R}_{\mathrm{eq}}=\frac{\frac{5 \mathrm{R}}{2} \times 2 \mathrm{R}}{\frac{5 \mathrm{R}}{2}+2 \mathrm{R}}=\frac{5 \mathrm{R}}{4.5}$
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