A battery consists of a variable number `n` of identical cells having internal resistance connected in series. The terminals of the battery are short circuited and the current `I` measured. Which one of the graph below shows the correct relationship between `I` and `n`?

Options

A.
B.
C.
D.

Answer

C

Explanation

Net emf will be `n epsi` and total resistance will be nr, hence current in the loop can be written as follows:
`I = (n epsi)/(n r) = (epsi)/(r )`
So, I is independent of n, hence option © is correct