Physics - Current Electricity Question with Solution | TestHub

When the current through$\mathrm{4\; \Omega }$resistance is zero, then$V_A- V_B=6 \mathrm{V}$




i.e., the potential difference across$2 \Omega$resistance would be$10-6=4 \mathrm{V}$

$\therefore$Current through$2 \mathrm{\Omega }$resistance is$2 \mathrm{A}$.

The potential difference across R is$\left(6-4\right) \mathrm{V}$and$2 \mathrm{A}$flows through it

$\stackrel{}{\Rightarrow } R =\frac{6-4}{2}$

$\therefore R=1 \mathrm{\Omega }$