Thousand cells of same emf E and same interna | vedclass

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(A) The total emf of the series combination is $1000E$ and the total internal resistance is $1000r$.Since there is no external resistance,the current

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(A) The total emf of the series combination is $1000E$ and the total internal resistance is $1000r$.Since there is no external resistance,the current $i$ in the circuit is given by $i = \frac{	ext{Total emf}}{	ext{Total resistance}} = \frac{1000E}{1000r} = \frac{E}{r}$.The potential drop across a single cell is given by $V = E - ir$.Substituting the value of $i$,we get $V = E - (\frac{E}{r})r = E - E = 0$.Since the potential drop across each individual cell is $0$,the total potential drop across any number of cells (including $399$ cells) connected in this series configuration will be $399 	imes 0 = 0$.

Thousand cells of same emf $E$ and same internal resistance $r$ are connected in series in the same order without an external resistance. The potential drop across $399$ cells is found to be ......... $E$.

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