Current Electricity Ques 54 — JEE PYQ Chapterwise

Answer:

Correct Answer: 54.(a)

Solution:

54. Given circuit with currents as shown in the figure below, [In the question $I_1=0.3$ $A$ is given, due to it we change the direction of $I_1$, in this figure]

From Kirchoff’s junction rule, $\Sigma I=0$

$ \begin{alignedat} & \text { At junction } S, \quad I _4=I _5+I _3 \\ & \Rightarrow \quad 0.8=0.4+I _3 \\ & \Rightarrow \quad I _3=0.4 A \\ & \text { At junction } P, \quad I _5=I _6 \\ & \Rightarrow \quad I _6=0.4 A \\ & \text { At junction } Q, \quad I _2=I _1+I _3+I _4 \\ I =0.3+0.4+0.4=1.1 A \end{aligned} $