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NEET Physics Electrostatics & Capacitance Question Bank NEET PYQ - Electrostatics and Capacitance

  • 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 [AIPMT (M) 2012]

    A)

    B)

    C)

    D)

    Correct Answer: C

    Solution :

    [c] 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 .


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