A battery consists of a variable number ' n ' of identical cells (having internal resistance ' r ' each) which are connected in series. The terminals - Physics MCQ NEET (UG) 2018 2026 | ExamTest.live

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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 ?

Solution & Step-by-step Explanation

When ' n' identical cells are connected in series, the total EMF is n ε and total internal resistance is n r .In a short-circuit condition (external resistance R = 0), the current I is: I = \frac{Total EMF}{Total Resistance} I = \frac{n ε}{n r} = \frac{ε}{r} Since ε and r are constant for identical cells, the current I is constant and does not depend on the number of cells n .

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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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