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JEE ADVANCE 2010
paper 1
Question
When two identical batteries of internal resistance $1 \Omega$ each are connected in series across a resistor R, the rate of heat produced in $R$ is $J_1$. When the same batteries are connected in parallel across $R$, the rate is $J_2$. If $\mathrm{J}_1=2.25 \mathrm{~J}_2$ then the value of R in $\Omega$ is
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