Question

The potential difference across $BC$ in the following figure will he:

• A. 1.2 V
• B. 2 V
• C. 0.8 V
• D. 1 V

Answer 1

Answer: (C)

The equivalent resistance of the circuit
$R=\left(\frac{4\times 2}{4+2}\right)+2=\frac{8}{6}+2=\frac{20}{6}$
$=\frac{10}{3}\Omega$
$\therefore$ Current through the circuit
$i=\frac{V}{R}=\frac{2}{10/3}=\frac{6}{10}=\frac{3}{5}A$
Therefore, potential difference across
$BCV=\frac{3}{5}\left(\frac{4\times 2}{4+2}\right)$
$=0.8$ volt