A coil takes 15 minutes to boil certain amount of water, another coil takes 20 minutes for the same process Time taken to boil the same amount of water when both the coils are connected in series across same source is
(a) 5 min
(b) 8.6 min
(c) 35 min
(d) 12 min
Correct option(c)
Explanation:
When two coils are connected in series, total time takes to boil the water.
t = t1 + t2
t1 = 15 min., t2 = 20 min.
t = 35 min
