For a cell terminal potential difference is \( 2.2 \mathrm{~V} \) when circuit is open and reduc...

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For a cell terminal potential difference is \( 2.2 \mathrm{~V} \) when circuit is open and reduces to \( 1.8 \mathrm{~V} \) when cell is connected to a resistance of \( R=5 \Omega \). Determine internal resistance of cell \( (r) \).
(a) \( \frac{10}{9} \Omega \)
(b) \( \frac{9}{10} \Omega \)
(c) \( \frac{11}{9} \Omega \)
(d) \( \frac{5}{9} \Omega \)
 
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