Q 1 :    

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 $n$?                [2018]

• [IMAGE 186]--

   

• [IMAGE 187]--

   

• [IMAGE 188]--

   

• [IMAGE 189]--