A cell having an emf \epsiv\epsiv 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:

  • Option 1)

  • Option 2)

  • Option 3)

  • Option 4)

 

Answers (1)

As discussed in 

Current in the circuit I=\frac{\epsilon }{R+r}

Potential difference across R:    V=IR=\left( \frac{\epsilon}{R+r} \right )R

When, 

R=0, \:\:\:\:\:V=0

R=\alpha , \:\:\:\:\:V=\epsilon


Option 1)

This option is incorrect.

Option 2)

This option is correct.

Option 3)

This option is incorrect.

Option 4)

This option is incorrect.

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