Q. Two cells, each of $e.m.f.\ E$ and internal resistance $r$ are connected in parallel between the resistance $R.$ The maximum energy given to the resistor will be, only when
A) $R = r/2$
B) $R = r$
C) $R = 2r$
D) $R = 0$
Explanation
(a) For maximum energy, we have
External resistance of the circuit
= Equivalent internal resistance of the circuit $i.e.\ R = \frac{r}{2}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.