Question

The effective resistance between $P$ and $Q$ for the following network is

• A. $\frac{1}{12 \, } \, \Omega $
• B. $21 \, \Omega $
• C. $12 \, \Omega $
• D. $\frac{1}{21} \, \Omega $

Answer 1

Answer: (C)

In the given circuit diagram, $3 \, \Omega $ and $3 \, \Omega $ are in series
$3+3=6 \, \Omega $
$6 \, \Omega $ and $6 \, \Omega $ are in parallel
$\frac{6 \times 6}{6 + 6}=3 \, \Omega $
This $3 \, \Omega $ is in series with $4 \, \Omega $ and 5 $\Omega $
$4+3+5=12 \, \Omega $