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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

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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