In the experiment to determine the internal resistance $(r)$ of a cell $(E_1)$ using a potentiometer,the resistance drawn from the resistance box is $R$. The potential difference across the balancing length of the wire is equal to the terminal potential difference $(V)$ of the cell. The value of the internal resistance $(r)$ of the cell is:
- A$R\left(\frac{E_1}{V}+1\right)$
- B$R\left(\frac{V}{E_1}-1\right)$
- C$R\left(\frac{V}{E_1}+1\right)$
- D$R\left(\frac{E_1}{V}-1\right)$
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