Physics · 2013
JEE Main · 22 April 2013, Shift 1 · Q6
A dc source of emf E_1=100 V and internal resistance r =0.5 Ω, a storage battery of emf E_2=90 V and an external resistance R are connected as shown…
A dc source of emf $\displaystyle \mathrm{E}_1=100 \mathrm{~V}$ and internal resistance $\displaystyle \mathrm{r}=0.5 \Omega$, a storage battery of emf $\displaystyle \mathrm{E}_2=90 \mathrm{~V}$ and an external resistance R are connected as shown in figure. For what value of R no current will pass through the battery ?
Official answer
(3)
$\displaystyle 4.5 \Omega$
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JEE Main 2013 Physics question, with the answer from NTA’s final answer key. Where our answers come from.