Teaching UP TGT Mock Test Series 2025 Physics Current, Resistance and Electricity Cells in Series and in Parallel
A cell of constant emf is first connected to a resistance R1 and then to R2. If power delivered in both cases are same, then the internal resistance of the cell is:
1
\(\sqrt{R_{1} R_{2}} \)
2
\(\sqrt{R_{1} / R_{2}} \)
3
\(\frac{R_{1}+R_{2}}{2} \)
4
\(\frac{R_{1}-R_{2}}{2}\)