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Standard XII

Physics

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Question

Figure below shows two paths that may be taken by a gas to go from a state $A$ to a state $c$ .
In process $A B, 400 J$ of heat is added to the system and in process $B C, 100 J$ of heat is added to the system. The heat absorbed by the system in the process $A C$ will be

500 J

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460 J

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300 J

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380 J

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Solution

The correct option is B $460 J$
In cyclic process $A B C A$
$Q_{c y c l e} = W_{c y c l e}$
$Q_{A B} + Q_{B C} + Q_{C A}$
$= a r .$ of $△ A B C + 400 + 100 + Q_{C \to A}$
$= \frac{1}{2} (2 \times 10^{- 3}) (4 \times 10^{4})$
$\Rightarrow Q_{C \to A} = - 460 J$
$\Rightarrow Q_{A \to C} = + 460 J$ .

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Figure below shows two paths that may be taken by a gas to go from a state A to a state c.In process AB,400 J of heat is added to the system and in process BC,100 J of heat is added to the system. The heat absorbed by the system in the process AC will be

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