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Question: Answered & Verified by Expert
In the circuit shown, the internal resistance of the cell is negligible. The steady state current in the $2 \Omega 2$ resistor is


PhysicsAlternating CurrentCOMEDKCOMEDK 2019
Options:
  • A $0.9 \mathrm{~A}$
  • B $1.5 \mathrm{~A}$
  • C $0.6 \mathrm{~A}$
  • D $1.2 \mathrm{~A}$
Solution:
2518 Upvotes Verified Answer
The correct answer is: $0.9 \mathrm{~A}$
In the steady state analysis capacitor acts as an open circuit. Therefore, the equivalent circuit is given as



Thus, current in the $4 \Omega$ resistor is zero. $2 \Omega$ and $3 \Omega$ resistors are parallel to each other. Thus, the resistance in the upper branch is given by
$$
R=\frac{2 \times 3}{2+3}=\frac{6}{5} \Omega
$$
The upper branch resistor are connected to $2.8 \Omega$ resistor in series. Therefore, equivalent resistance in the circuit is given by
$$
\begin{aligned}
R_{\mathrm{eq}} & \approx 28+\frac{6}{5} \\
&=\frac{14.0+6}{5}=4 \Omega
\end{aligned}
$$
Current, $I=\frac{\text { Voltage }}{\text { Resistance }}=\frac{6}{4}=15 \mathrm{~A}$
Current in the $2 \Omega$ resistor is given by current division rule
$$
\begin{aligned}
\text { i.e. } & I_{2 \Omega}=I \times \frac{3 \Omega}{2 \Omega+3 \Omega} \\
\Rightarrow \quad & I_{2 \Omega}=1.5 \times \frac{3}{5}=0.9 \mathrm{~A}
\end{aligned}
$$

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