The first law of thermodynamics for isothermal process is:

q = - W

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Δ U = W

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Δ U = q_{v}

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Δ U = - q_{v}

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Solution

The correct option is A $q = - W$
According to the first law of thermodynamics
$Δ U = q + W$
For an isothermal process, $Δ U = 0$
Hence,

$q + W = 0$ or
$q = - W$

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