Q. A wire has a resistance of $12\ ohm.$ It is bent in the form of equilateral triangle. The effective resistance between any two corners of the triangle is
A) $9\ ohm$
B) $12\ ohm$
C) $6\ ohm$
D) $8/3\ ohm$
Explanation
(d) As resistance $\propto$ Lengt
$\therefore$ Resistance of each arm $= \frac{12}{3} = 4\Omega$
$\therefore R_{effective} = \frac{4 \times 8}{4 + 8} = \frac{8}{3}\Omega$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.