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(C) The terminal potential difference $V$ of a cell is given by the formula $V = E - Ir$,where $E$ is the $E.M.F.$,$I$ is the current,and $r$ is the i

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Zero

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(C) The terminal potential difference $V$ of a cell is given by the formula $V = E - Ir$,where $E$ is the $E.M.F.$,$I$ is the current,and $r$ is the internal resistance of the cell.When a cell is short-circuited,the external resistance $R$ is equal to $0$.The current flowing through the circuit is $I = E / (R + r) = E / (0 + r) = E/r$.Substituting this value of $I$ into the terminal potential difference formula: $V = E - (E/r) 	imes r = E - E = 0$.Therefore,the terminal potential difference of a cell when short-circuited is $0$.

The terminal potential difference of a cell when short-circuited is ($E$ = $E.M.F.$ of the cell).

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