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Q.

A system ‘S’ receives heat continuously from an electrical heater of power 10W. The temperature of S becomes constant at 50°C when the surrounding temperature is 20°C. After the heater is switched off, S cools from 35.1°C to 34.9°C in 1 minute. The heat capacity of S is

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a

750J(°C)-1

b

1500J(°C)-1

c

3000J(°C)-1

d

6000J(°C)-1

answer is B.

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Detailed Solution

dQdt∝T−T0;10=β(50−20);β=13(ms)θ1−θ2t=βθ1+θ22−θshere θ1=35.1∘C;θ2=34.9∘C

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