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NEET 2018 · Cells: EMF, Internal Resistance & Combinations

Cells: EMF, Internal Resistance & Combinations question from NEET 2018

Q36NEET 2018Medium

Cells: EMF, Internal Resistance & Combinations

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?

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Answer: (a)

Short circuit: $I = \frac{nE}{nr} = \frac{E}{r}$
$I$ does not depend on $n$ , so the graph is a horizontal line.
So the answer is (a).

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