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Question

A battery consists of a variable number n of identical cells (having internal resistance r each) which are connected in series. The terminal of the battery are short circuited and the current I is measured. Which of the graph shows the correct relationship between I and n ?

A
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B
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C
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D
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Solution

The correct option is C
Equivalent Emf, ε=nε
Equivalent resistance, R=nr
Current, I=εR=nεnr=εr
I is independent of ε

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