Question

Heater coil $A$ takes $t_1$ second to boil certain quantity of water. Heater coil $B$ takes $t_2$ second to boil same quantity of water. If $A$ and $B$ are connected in series, the time taken to boil the same quantity of water by the combination is

• A. $\sqrt {t_1t_2}$
• B. $t_1+t_2$
• C. $\frac {1}{2}(t_1+t_2)$
• D. $\frac {t_1t_2}{t_1+t_2}$

Answer 1

Answer: (B)

$t_1+t_2$

Answer 2

Answer (b) $t_1+t_2$