figure shows mixed grouping of identical cells each of EMF 4V and internal resistance 1 ohm the combination can be replaced by an equivalent cell between A and B having EMF E and internal resistance r where
Eeff for n no.of identiical cells connected in series combination =nE where E is individual EMF of 1 such cell
Eeff=6*4=24 V
reff for n no.of identical cells connected in series combination =nr where r is individual internal resistance of 1 such cell
reff=6*1=6ohms
so the question gets simplified according to this formula as 3 cells with EMF of 24 V each and internal resistance 6 ohms connected parallel
Eeff for n no.of identiical cells connected inparallel combination =E where E is individual EMF of 1 such cell
E'eff=24V
reff for n no.of identical cells connected in parallel combination =r/n where r is individual internal resistance of 1 such cell
r'eff=6/3=2 ohms
Eeff=6*4=24 V
reff for n no.of identical cells connected in series combination =nr where r is individual internal resistance of 1 such cell
reff=6*1=6ohms
so the question gets simplified according to this formula as 3 cells with EMF of 24 V each and internal resistance 6 ohms connected parallel
Eeff for n no.of identiical cells connected inparallel combination =E where E is individual EMF of 1 such cell
E'eff=24V
reff for n no.of identical cells connected in parallel combination =r/n where r is individual internal resistance of 1 such cell
r'eff=6/3=2 ohms