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CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2006

  • question_answer
    A battery consists of a variable number (n) of identical cells, each having an internal resistance r connected in series. The terminals of the battery are short-circuited. A graph of current \[(I)\] in the circuit versus the number of cells will be as shown in figure:

    A)       

    B)  

    C)       

    D)  

    Correct Answer: C

    Solution :

    For a two cell battery                 \[I=\frac{2E}{2r}=\frac{E}{r}\] Similarly, for a n cell battery                 \[I=\frac{nE}{nr}=\frac{E}{r}\] So, current in the circuit does not depend on no. of cells in the battery. Hence, the correct graph will be [c].


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