Question

The resistance across $A$ and $B$ in the figure below will be

• A. $3R$
• B. $R$
• C. $\frac{R}{3}$
• D. None of these

Answer 1

Answer: (C)

Three resistances are in parallel, so effectively the resistance would be equal to
$\frac{1}{R_{\text{eff }}}=\frac{1}{R}+\frac{1}{R}+\frac{1}{R}=\frac{3}{R}$
So, $R_{\text{eff }}=\frac{R}{3}$