Q. An external resistance $R$ is connected to a battery of $e.m.f.\ V$ and internal resistance $r.$ The joule heat produced in resistor $R$ is maximum when $R$ is equal to
A) $r$
B) $\frac{r}{2}$
C) $2r$
D) Infinitely large
Explanation
(a) For maximum joule heat produced in resistor external resistance = Internal resistance
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.