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NEET AIPMT SOLVED PAPER MAINS 2012

  • question_answer
    A cell having an emf e and internal resistance r is connected across a variable external resistance R. As the resistance R is increased, the plot of potential difference V across R is given by       

    A)                                                 

    B)  

    C)  

    D)  

    Correct Answer: C

    Solution :

    Here, \[E=I(R+r)\Rightarrow E=IR+Ir\] and        \[E=V+Ir\]                 \[E=V+\frac{Er}{R+r}\]                 \[V=E-\frac{E}{R+r}\times r\]                 \[y=c-\frac{1}{x}\] This equation represents option [c].


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