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NEET Sample Paper NEET Sample Test Paper-2

  • question_answer
    A cell of emf \[\varepsilon \] is connected across a resistance R. The potential difference between the terminals of the cell is found to be \[\upsilon \]. The internal resistance of the cell must be:

    A)  \[\frac{2(E-V)V}{R}\]

    B)  \[\frac{2(E-V)R}{E}\]

    C)  \[\frac{(E-V)R}{V}\]  

    D)  \[(E-V)R\]

    Correct Answer: C

    Solution :

    As,  \[V=E-lr\]  and \[I=\frac{E}{R+r}\] \[\Rightarrow \] \[r=\frac{(E-V)R}{V}\]


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