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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?

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a

b

c

d

answer is B.

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Detailed Solution

i=nEnr=Er= 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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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?