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The initial state A has the temperature T_A, U_Ais the internal energy of the system. By applying the mechanical work, new state B is achieved with the temperature T_B and having the internal energy U_B. Given the T_B > T_A. What is the correct expression for the change in internal energy ( $∆$ U) ?

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$U_{A} - U_{B}$

$U_{B} = U_{A}$

U_B - 2U_A

$U_{B} - U_{A}$

answer is B.

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Detailed Solution

Since T_B > T_A ,internal energy in the final state is more than internal energy in the initial state

$∆ E$ = U_B - U_A

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