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  4. A straight line plot showing the terminal potential difference (V) of a cell as a function of current (I) drawn from it, is shown in the figure. The internal resistance of the cell would be then-

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Q. A straight line plot showing the terminal potential difference (V) of a cell as a function of current (I) drawn from it, is shown in the figure. The internal resistance of the cell would be then-Physics Question Image

Current Electricity

Solution:

$I=O, V=E, $
$ \therefore E=5.6 V$
$r =\frac{E}{I}=\frac{5.6}{2.0}=2.8 \Omega$