Q. A battery consists of a variable number 'n' of identical cells (having internal resistance 'r' each) which are connected in series. The terminals of the battery are short-circuited and the current I is measured. Which of the graphs shows the correct relationship between I and n ?
A) [image:2018_Q7_opt_a.png]
B) [image:2018_Q7_opt_b.png]
C) [image:2018_Q7_opt_c.png]
D) [image:2018_Q7_opt_d.png]
Explanation
[Solution] $I = \frac{nE}{nr} = \frac{E}{r}$, independent of n: a horizontal line (graph 3). Answer (3).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.