A cell having emf E and internal resistance r is connected across a variable resistance R. As the resistance R is increased the plot of the potential difference V across  R is given by

A cell having emf E and internal resistance r is connected across a variable resistance R. As the resistance R is increased the plot of the potential difference V across  R is given by

  1. A
  2. B
  3. C
  4. D

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    Solution:

    Potential difference across R, V=IR=ERR+r=E1+rR
     When R=0,V=0 and   When R=,V=E

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