Q. In the circuit shown the equivalent resistance between A and B is
A) 27$\ \Omega$
B) 18$\ \Omega$
C) 9$\ \Omega$
D) 3$\ \Omega$
Explanation
(d) The three resistances between A and B are parallel,
$\frac{1}{R_{comb}} = \frac{1}{R_{1}} + \frac{1}{R_{2}} + \frac{1}{R_{3}}$
$\ \ \ \ \ \ \ \ \ \ \ \ \ = \frac{1}{9} + \frac{1}{9} + \frac{1}{9}$
$\frac{1}{R_{comb}} = \frac{3}{9}$
$\Longrightarrow \ \ \ R_{comb} = 3\Omega$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.