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An external voltage opposing the cell po...

An external voltage opposing the cell potential is applied to a Daniel cell with zinc and copper electrodes. What happen when the external emf is increased from 0.8V to 1.1 V and then 1.54 V ?

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(i) Working principle of Daniel cell.
(ii) Calculation of cell emf.
(iii) Comparison of the cell emf with the external voltage applied.
(iv) Determination of direction of current depending on the magnitude of the external voltage
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