Question

Thousand cells of same emf $E$ and same internal resistance $r$ are connected in series in same order without an external resistance. The potential drop across $99$ cells is found to be

• A. zero
• B. $399E$
• C. $601E$
• D. $1000E$

Answer 1

The correct option is A zero

$I=\frac{1000E}{1000r}$ (Because cells are in series)

$=\frac{E}{r}$

Potential drop across $1cell=E-Ir$

$=E-\left(\frac{E}{r}\right)r$

$=0$

Therefore, for 99 cells potential drop is 0.