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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:

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$∆ Q = - ∆ W - ∆ U$

$∆ Q = ∆ U - ∆ W$

$∆ Q = ∆ W - ∆ U$

$∆ Q = ∆ U + ∆ W$

answer is B.

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Detailed Solution

From FLOT $∆ Q = ∆ U + ∆ W$

∵ Heat supplied to the system so ∆Q → Positive

And work is done on the system so ∆W → Negative

Hence + ∆Q = ∆U – ∆W

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