In which of the following cells is the potent | vedclass

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(B) The terminal potential difference $V$ of a cell with $EMF$ $\varepsilon$ and internal resistance $r$ is given by $V = \varepsilon - Ir$ when the c

Vedclass · Accepted Answer

$b$

Vedclass · Answer

(B) The terminal potential difference $V$ of a cell with $EMF$ $\varepsilon$ and internal resistance $r$ is given by $V = \varepsilon - Ir$ when the cell is discharging (current $I$ flows out of the positive terminal).When the cell is charging (current $I$ flows into the positive terminal),the terminal potential difference is given by $V = \varepsilon + Ir$.In option $a$,the current $I$ flows out of the positive terminal,so $V = \varepsilon - Ir In option $b$,the current $I$ flows into the positive terminal,so $V = \varepsilon + Ir > \varepsilon$.In option $c$,there is no current,so $V = \varepsilon$.In option $d$,the current $I$ flows out of the positive terminal,so $V = \varepsilon - Ir Therefore,the potential difference is greater than the $EMF$ in case $b$.

In which of the following cells is the potential difference between the terminals of the cell greater than its $EMF$?

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