Physics
Physics, 15.04.2021 14:00, zwalkert01

Theresistance per unit length of a piece of a copper wire with circular cross-section with diameterof 1.03 mm is 2.5 x 10-4Ω/cm. concentration of free electrons is 8.4 x 1028/m3. The current densityis 2.1 x 106A/m2(Assume that the free hole concentration equal zero).

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