In the following circuit if $V_A -V_B = 6\,V$ then the value of resistance $R$ (in $ohm$) is ............... $\Omega$
Medium
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$\mathrm{V}_{\mathrm{AB}}=\frac{7 / 10+4 / \mathrm{R}}{1 / 10+1 / \mathrm{R}}$
$\mathrm{R}=20\, \Omega$
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