A variable resistor R is connected across a cell of emf  E and internal resistance r as shown in the figure. Draw a plot showing the variation of 
(i) terminal voltage V and
(ii) the current I,
as a function of R​

Dear Student,

Please find below the solution to the asked query:

The formula of terminal voltage is $V=\frac{\epsilon R}{R+r}$ and the graph is shown bellow. 

The current I is given by $I=\frac{\epsilon }{R+r}$, and the graph is 


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