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Questions  

An electrically heated coil is immersed in a calorimeter containing 360 gm of water at 100C. The coil consumes energy at the rate of 90W. The water equivalent of the calorimeter and coil is 40 gm. The temperature of water after 10 min is

a
4.2140C
b
42.14 0C
c
300C
d
23 0C

detailed solution

Correct option is B

energy given by heater=P×t=90×10×60 Jheat absorbed by water and calorimeter system is =( M+Mc) Sw(t-10)90×60×10=400×10-3×4200 (t-10)t= 42.14C  0

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