Discussion Forum

1)

Two batteries of different emfs and different internal resistances are connected as shown. The voltage across AB in volt is

Answer:

Option C

Explanation:

$V_{AB}$= Equivalent emf of two batteries in parallel.

=  $\frac{ E_{1}/r_{1}+E_{1}/r_{2}}{1/r_{1}+1/r_{2}}$

 $= \frac{(6/1)+(3/2)}{(1/1)+(1/20}=5 V$

 $\therefore$ Answer is 5