12. After incandescent lamp current flows I = 1 A. The

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12. After incandescent lamp current flows I = 1 A. The temperature t tungsten filament diameter d1 = 0,2 mm is 2000 ° C. The current is supplied copper wire S2 = 5 mm2. Determine the strength of the electrostatic field: 1) in tungsten; 2) copper. The resistivity tungsten at 0 ° C ρ0 = 55 Nm Nominal its temperature coefficient of resistance α1 = 0,0045 deg-1 copper resistivity ρ2 = 17 Nm Nom.

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Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)

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