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  4. The current I1 (in A) flowing through 1 Ω resistor in the following circuit is :

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Q. The current $I_1$ (in A) flowing through 1 $\Omega$ resistor in the following circuit is :Physics Question Image

JEE MainJEE Main 2020Current Electricity

Solution:

Equivalent resistance of upper branch of circuit $R=2.5 \,\Omega$
image
Voltage across upper branch $=1 \,V$
$i=1 / 2.5=0.4 \,A$
$I_{1}=0.2 \,A$