If $Q$ and $W$ represent the heat supplied to the system and the work done on the system respectively, then the first law of thermodynamics can be written as:

Q = Δ U + W

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Q = Δ U - W

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Q = W - Δ U

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None of these

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Solution

The correct option is B $Q = Δ U - W$
From First law of thermodynamics,
$Δ U = Q + W$

$∵$ Heat supplied to the system so $Q \to$ Positive
and work is done on the system so $W \to$ Positive

Hence, $Q = Δ U - W$

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Similar questions

Δ Q

Δ W

If the first law of thermodynamics is represented by $Δ u = q + w$ . The $q$ & $w$ represent?

Δ U = q + w

W

△ U

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