In the given circuit reading of ideal voltmeter is $\frac{E}{2}$ then internal resistance of cell is ............. $\Omega$
Medium
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$\frac{\varepsilon}{2}=\varepsilon-i r$ or $i=\frac{\varepsilon}{2 r}$
$2 \varepsilon=i(3+r)$
$r=1 \Omega$
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