Medium
For a cell,the terminal potential difference $(P.D.)$ is $2.2\;V$ when the circuit is open and reduces to $1.8\;V$ when the cell is connected to an external resistance of $R = 5\;\Omega$. Determine the internal resistance $(r)$ of the cell.
- A$\frac{10}{9}\;\Omega$
- B$\frac{9}{10}\;\Omega$
- C$\frac{11}{9}\;\Omega$
- D$\frac{5}{9}\;\Omega$
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