JEE Advanced 2010 Physics question
When two identical batteries of internal resistance each are connected in series across a resistor R, the rate of heat produced in R is . When the same batteries are connected in parallel across R, the rate is . If then the value of R in is
Answer: 4
Solution
Let each battery have emf E and internal resistance . Series: total emf 2E, total internal resistance , so and . Parallel: emf E, internal resistance , so $ =
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