Question

A battery consist of a variable number of $n$ identical cells having internal resistance $r$ each. They are connected in parallel. The terminal of battery is short-circuited and the current $I$ is measured. Which of the following graphs give correct relationship between $I$ and $n$?

• A.
• B.
• C.
• D.

Answer 1

The correct option is A

As $n$ cells are in parallel so net resistance $R_n=r/n$
Now current is $I=\frac{E}{R_n}=\frac{En}{r}$ where $E=$ emf of battery.
This is a straight line equation $(y=mx)$ graph.