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Tushar Watts Grade: 12
        

Ques) A coil of current crrying Nichrome wire is immersed in aliquid. When the potetial difference across the coil is 12 V and the current through the coil is 5.2 A., the liquidm evaporated at the steady rate of 21mg/sec. Calculate the heat of  Vapourization of the liquid.

7 years ago

Answers : (3)

AskIITians Expert PRASAD IIT Kharagpur
18 Points
										

Power consumed = V*I = 12 *5.2 = 62.4 J/s.


Rate of evapoation = 21 mg/s = 2.1 * 10-5  kg /s


Power consumed = Heat gaines by water per second


Heat of Vaporization, H  = 62.4 / (2.1 * 10-5)  =  2971 KJ/kg =710 Kcal / kg.

7 years ago
Ramesh V
70 Points
										

heat generated in coil (H) = I2Rt


given V =12 and I = 5.2 A , by ohms law, R = V/I = 12/5.2 =2.3 ohms


dH/dt = I2R  = 62.2 J/sec


let specific heat of vapourisation is:  L J/g


rate of evaporation is : m' = 21x10-3 g/sec


so, dH/dt = m' * L 


L = (dH/dt)/ m'


L= 62.2 / 21x10-3


L = 2961.5 J/gram


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IIT Kgp - 2005 batch

7 years ago
Vanya Saxena
18 Points
										

Heat generated per sec due to the current carrying coil,


                                                                                        H=VI  =>H =12*5.2 J/sec


 This heat will be equal to the latent heat of vapourization as the same is responsible for the vapourization of the liquid,


                                                       VI=mL      =>12*5.2=21/1000*L


                                                                 L=29.71*10^2 J/Kg


 

7 years ago
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