Question

Eight identical cells each of potential E and internal resistance r are connected in series to form a closed circuit. An ideal voltmeter connected across 2 cells will read :-

• A. 13 E
• B. zero
• C. 2 E
• D. 10 E

Answer 1

The correct option is B zero

Applyin Kirchoff's voltage law on the closed loop gives,

$8E-8\left(ir\right)=0$

Hence, $i=\frac{E}{r}$

Hence potential difference across A and B= $2E-2\left(ir\right)=0$