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1st Law of Thermodynamics

In changing t...

Question

In changing the state of thermodynamics from A to B state, the heat required is $Q$ and the work done by the system is $W$ . The change in its internal energy is

Q + W

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Q - W

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Q

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\frac{Q - W}{2}

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Solution

The correct option is B $Q - W$
$Δ Q = Δ U + Δ W$
$\Rightarrow$ $Δ U = Δ Q - Δ W = Q - W$ (Using proper sign)

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