A copper wire 100m long with cross-sectional area of 2x10 -4 cm 2 is heated from room temperature of 25 0 C to 200 0 C. Find c) The drift speed of the “electron group” in the wire, if the current is 3A and density of electrons is 8.5x10 28 electrons /m3 d) The voltage drop across the wire resistor for this current of 3A

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