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A $9\; V$ battery with internal resistance of $0.5\; Ω$ is connected across an infinite network as shown in the figure. All ammeters $A_1, A_2, A_3$ and voltmeter $V$ are ideal.

Choose correct statement.

$\begin{array}{1 1}(1)\; Reading\; of\; A_1 \;is\; 2\; A \\ (2)\; Reading\; of\; A_1\; is\; 18\; A \\ (3)\; Reading\; of\; V\; is\; 9\; V \\ (4)\; Reading\; of\; V\; is\; 7\; V \end{array} $

1 Answer

$\begin{align*} X = \frac{4X}{4 + X} + 2 \end{align*}$
$\begin{align*} X = \frac{8 + 6X}{4 + X} \end{align*}$
$4X + X^2 = 8 + 6X$
$X^2 - 2X -8 = 0$
$\begin{align*}X &= \frac{2 \pm \sqrt{4 -4(1)(-8) }}{2} \\ & = \frac{2 \pm \sqrt {36}}{2} \\ & = \frac{2 \pm 6}{2} = 4 \\A' &= \frac{9}{4 + 0.5} = 2 \\ A' & = 9\end{align*} $
answered Jun 6, 2017 by priyanka.c
 

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