Physics · 2022
JEE Main · 27 July 2022, Shift 1 · Q41
Two sources of equal emfs are connected in series. This combination is connected to an external resistance R. The internal resistances of the two…
Two sources of equal emfs are connected in series. This combination is connected to an external resistance R . The internal resistances of the two sources are $\displaystyle \mathrm{r}_1$ and $\displaystyle r_2$ $\displaystyle \left(r_1>r_2\right)$. If the potential difference across the source of internal resistance $\displaystyle r_1$ is zero, then the value of R will be :
Official answer
(1)
$\displaystyle r_1-r_2$
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JEE Main 2022 Physics question, with the answer from NTA’s final answer key. Where our answers come from.