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In Joule’s Calorimeter experiment, when a current of 1 Ampere is passed through a coil for a known interval of time ‘t’, the temperature of water increases from 30Cto 33C. When a current 2A is passed through the same coil placed in the same quantity of water and for the same time, the temperature of water increases from 30C to,
A. 33C
 B. 36C
C. 39C
D. 42C

Answer
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Hint:A Calorimeter is a device used to measure the amount of heat involved in a chemical or physical process. For example, when an exothermic reaction occurs in a calorimeter, the heat produced by the reaction is absorbed by the solution, which increases its temperature. The principle of Calorimeter indicates the law of conservation of energy.

Formulae Used: We will be using the relation of1) Heat is related to the rise in temperatureH=mcdT and 2) Joule’s equation of electrical heating H=i2Rt

Complete step by step answer:
When a resistor absorbs electrical energy, it dissipates the energy in the form of heat H. If the resistor is placed in the calorimeter, the amount of heat produced can be measured when it is absorbed in the calorimeter. The heat Q produces a temperature rise dT. The resistor coil is immersed in the water in a calorimeter. The heat Q produces a temperature rise dT. The heat is related to dT
The heat generated in water that resulted in the temperature of water increases from 30Cto 33C is given by,
H=mcdT
Where m is the mass of water
dT= (3330)=3 is the temperature difference.
Current passed through the coil, i1=1A
Therefore H is equal to i2Rt
Where, i, R, and t are the current, resistance of the coil, and temperature respectively.
i2Rt=mcdT
Here R, t, C, and m remain the same, but current increased toi2=2A
Hence, i22=mcdT
Dividing the two equations,
dTdT=2212 (C)
dT=12
Therefore, the final temperature=30+12=42C

 Option D) 420C

Note:A Calorimeter is a device used to measure the amount of heat involved in a chemical or physical process. For example, when an exothermic reaction occurs in a calorimeter, the heat produced by the reaction is absorbed by the solution, which increases its temperature. The principle of Calorimeter indicates the law of conservation of energy.