A Cu wire of diameter of 2 mm and length of 1 m initially room temperature of 300 K is applied a constant voltage difference of 100 V for 1000 seconds. The temperature of the wire rose from Joule heating during the application of the voltage, so one waited for a long enough time after the voltage is removed for the wire to cool back to the room temperature of 300 K. The conductivity of Cu is 6×107S/m. Please answer the following questions, assuming the surroundings is at room temperature 300 K: What is the internal energy change for the wire for the entire process?

A Cu wire of diameter of 2 mm and length of 1 m initially room temperature of 300 K is applied a constant voltage difference of 100 V for 1000 seconds. The temperature of the wire rose from Joule heating during the application of the voltage, so one waited for a long enough time after the voltage is removed for the wire to cool back to the room temperature of 300 K. The conductivity of Cu is 6×107S/m. Please answer the following questions, assuming the surroundings is at room temperature 300 K:

What is the internal energy change for the wire for the entire process?

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