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CET Karnataka Engineering CET - Karnataka Engineering Solved Paper-2010

  • question_answer
    A battery of emf E has an internal resistance r. A variable resistance R is connected to the terminals of the battery. A current; is drawn from the battery. V is the terminal potential difference. If R alone is gradually reduced to zero, which of the following best describes \[i\]and V?

    A) \[i\]approaches zero, V approaches E

    B) \[i\] approaches \[\frac{E}{r}\], V approaches zero

    C) \[i\] approaches \[\frac{E}{r}\], V approaches E

    D) \[i\] approaches infinity, V approaches E

    Correct Answer: B

    Solution :

    Current, \[i=\frac{E}{R+r}\] when R decreases to \[0,\,i=\frac{E}{r}\] Similarly, potential difference \[V=iR\] when R decreases to \[0,\,V=0\]


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