Q. A source of a primary cell is 2V. what is the short circuited it provides 4A current, then the internal resistance of cell will be
A) 8$\ \Omega$
B) 2.0$\ \Omega$
C) 4$\ \Omega$
D) 0.5$\ \Omega$
Explanation
(d) From the relation, current $i = \frac{V}{r}$
$or\ \ \ \ 4 = \frac{2}{r}$
$or\ \ \ r = \frac{1}{2}\Omega$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.