A) \[1\,\Omega \]
B) \[3\,\Omega \]
C) \[\frac{1}{2}\,\Omega \]
D) \[3.5\,\Omega \]
E) \[\frac{3}{2}\,\Omega \]
Correct Answer: B
Solution :
From ohms law \[I=\frac{2E}{2r+R}\] In parallel combination of two cells, the current through the external resistance r will be \[I=\frac{E}{\frac{r}{2}+R}=\frac{2E}{2r+R}\] If\[I=I\]If then \[2r+R=r+2R\] \[\Rightarrow \] \[R=r=3\,\Omega \]You need to login to perform this action.
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