For a cell terminal potential difference is 2.2V when circuit is open and reduce to 1.8 V when cell is connected to a resistance of R = 5 $\Omega $. Determine internal resistance of cell (r)
${{10} \over 9}\Omega $
${{9} \over 10}\Omega $
${{11} \over 9}\Omega $
${{5} \over 9}\Omega $
Solution
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