The current $I_{1}$ (in $A$) flowing through $1\; \Omega$ resistor in the following circuit is:
JEE MAIN 2020, Medium
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Equivalent resistance of upper branch of circuit $\mathrm{R}=2.5 \Omega$
Voltage across upper branch $=1 \mathrm{V}$
$\Rightarrow \quad i=\frac{1}{2.5}=.4 \mathrm{A}$
$\Rightarrow \mathrm{I}_{1}=0.2 \mathrm{A}$
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