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What is the relationship between potenti...

What is the relationship between potential difference across the terminalsof a cell and emf of the cell?

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When the cell is in open circuit , then potential difference across its terminals is equal to emf of the cell.
When the cell is delivering current tl to a load, potential difference across its terminals is less than emf i.e., `V = epsilon- Lr`.
When the cell is being charged by passing current l through it, potential difference across its terminals is more than emf i.e, `V = epsilon+lr`.
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