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When a system is taken from state i to a state f along path iaf, Q = 50 J and W = 20 J. Along path ibf, Q = 35 J. If W = -13 J for the curved return path f i, Q for this path is

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33 J

23 J

-7 J

-43 J

answer is D.

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Detailed Solution

$∆$ U remains same for both path

For path iaf: $∆ U = ∆ Q - ∆ W = 50 - 20 = 30 J$

For path fi: $∆ U = - 30 J and ∆ W = - 13 J$

$\Rightarrow ∆ Q = - 30 - 13 = - 43 J .$

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