A cell of constant emf is first connected to a resistance R 1 and then connected to a…
Physics · Class 12 · CBSE — Current Electricity
A cell of constant emf is first connected to a resistance R1 and then connected to a resistance R2. If power delivered in both cases is same, then the internal resistance of the cell is:
- \(\sqrt{R_{1} R_{2}}\)
- \(\sqrt{\frac{R_{1}}{R_{2}}}\)
- \(\frac{R_{1} \ - \ R_{2}}{2}\)
- \(\frac{R_{1} \ + \ R_{2}}{2}\)
Answer
(A) R_ 1 R_ 2
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