All the heat generated by a current of 2A passing through a resistor of 6\Omega for 25s is used to evaporate 5 g of a liquid at its boiling point. What is the specific latent heat of the liquid?
A
60 Jg-1
B
120 Jg-1
C
300 Jg-1
D
360 Jg-1
E
1500 Jg-1
Verified Correct Answer: B.
Physical Principles & Numerical Solution
Electrical Energy = Heat Energy.
I2Rt = ml
22 x 6 x 25 = 5 x L.
L = 120 Jg-1.
Source: Myschool Past Questions Archive (Record #23914)