Q. Four resistances $10\ \Omega,\ 5\ \Omega,\ 7\ \Omega$ and $3\ \Omega$ are connected so that they form the sides of a rectangle $AB,\ BC,\ CD$ and $DA$ respectively. Another resistance of $10\ \Omega$ is connected across the diagonal $AC.$ The equivalent resistance between $A$ and $B$ is
A) $2\ \Omega$
B) $5\ \Omega$
C) $7\ \Omega$
D) $10\ \Omega$
Explanation
(b) The figure can be drawn as follows
$\Rightarrow R_{AB} = 5\Omega$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.