Question

What is the effective resistance between points P and Q?

• A. 5 $\Omega$
• B. 10 $\Omega$
• C. 15 $\Omega$
• D. 20 $\Omega$

Answer 1

The correct option is A 5 $\Omega$

Equivalent circuit of the above figure is shown.

$\therefore$ Effective resistance between P and Q, $\frac{1}{R_{PQ}}=\frac{1}{20}+\frac{1}{15}+\frac{1}{12}$

$⟹$ $R_{PQ}=5\Omega$