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If we take water at temperature \( T_{A} \) in a container having thermally conducting walls and enclosed in a huge heat reservoir at temperature \( T_{B} \). What is the correct expression of change in internal energy if no work is done at constant volume?
(a) \( \Delta U=U_{B}-U_{A} \)
(b) \( \Delta U=q \)
(c) \( \Delta U=W_{\text {ad }} \)
(d) All of these
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