Consider first two cells in series as shown in figure. The potential difference between the terminals A and C of the combination is
Options:
(a) `V_(AC)=epsilon_1-lr_1`
(b) `V_(AC)=epsilon_2-lr_2`
(c) `V_(AC)=epsilon_(eq)-lr_(eq)`
(d) `V_(AC)=2epsilon_(eq)-lr_(eq)`