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Question

The given figure shows a change of state A to state C by two paths ABC and AC for an ideal gas. Calculate the internal energy at C if the internal energy of gas at A is 10 J and amount of heat supplied to change its state to C through the path AC is 200 J.
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A
170 J
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B
200 J
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C
160 J
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D
40 J
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Solution

The correct option is A 170 J
According to Ist law of thermodynamics, for the path AC
q=ΔUw
or ΔU=q+(w)=200+(40)=160J

or UCUA=160J
UC=160+10=170J(UA=10J)

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