A system is changed from state A to B by one path and from B to A by another path. If ΔE1 and ΔE2 are corresponding changes in internal energy, what is the value of sum of these two internal energies ?
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Explanation:
Internal energy is a state function,it is independent of the path taken
Therefore, internal energy in a round trip is 0
It means, ◇Ua-a = 0
=> ◇Ua-b + ◇Ub-a = 0
=> E1 + E2 = 0
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