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 :

[c] \[\text{I=}\frac{\text{n}\varepsilon }{\text{nr}}\text{=}\frac{\varepsilon }{\text{r}}\]

So, I is independent of n and I is constant.

\[\therefore \]