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  4. In the circuit shown, the current in the 1 Ω resistor is

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Q. In the circuit shown, the current in the $1\, \Omega$ resistor isPhysics Question Image

JEE MainJEE Main 2015Current Electricity

Solution:

image
$\frac{x+9}{5}+\frac{x-6}{3}+\frac{x}{1}=0$
$\Rightarrow \frac{3 x+27+5 x-30+15 x}{15}=0$
$\Rightarrow x=\frac{3}{23} A$
from $Q$ to $P$