Q116 / 180 · NEET 2018 · Physics

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?

  • A

    Figure

  • B

    Figure

  • C

    Figure

  • Correct answer
    D

    Figure

Solution

Figure

In series, ε net =nε

and r net =nr

current in circuit
I= nε nr = ε​ r = constant.

⇒I independent of n

Hence, the correct answer is option: 'D'.

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