No work is done on the system, but \( q \) amount of heat is taken out from the system and given...

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No work is done on the system, but \( q \) amount of heat is taken out from the system and given to the surrounding. The change in internal energy of a system is
(a) \( \Delta U=-q \)
(b) \( \Delta U=+q \)
(c) \( \Delta U=W_{\text {ad }} \)
(d) \( \Delta U=q-W \)
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