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 $\Omega$
$4+3+5=12\Omega$