First slide

Cell

Question

A battery consists of a variable number n of identical cells having internal resistance r each. They are connected in series. The terminals of the battery are short circuited and the current i is measured. Which of the graphs [fig] gives correct relationship between i and n?

Easy

A
B
C
D

Solution

$i = \frac{nE}{nr} = \frac{E}{r} = constant$
The expression for i is independent of n and hence the graph is a straight line parallel to X axis

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