Q. The $emf$ of a battery is $2\ V$ and its internal resistance is $0.5\ \Omega.$ The maximum power which it can deliver to any external circuit will be
A) $8\ Watt$
B) $4\ Watt$
C) $2\ Watt$
D) None of the above
Explanation
(c) $P_{\max} = \frac{E^{2}}{4r} = \frac{(2)^{2}}{4 \times 0.5} = 2W$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.