question_answer

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? [NEET - 2018]

A)            

B)  

C)          

D)

Correct Answer: C

Solution :

 \[\text{I=}\frac{\text{n}\varepsilon }{\text{nr}}\text{=}\frac{\varepsilon }{\text{r}}\] So, I is independent of n and I is constant. \[\therefore \]