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1. If the 0.100 mm diameter tungsten filament in a light bulb is to have a...

1. If the 0.100 mm diameter tungsten filament in a light bulb is to have a resistance of 0.177 Ω at 20.0°C, how long should it be? The resistivity of tungsten at 20.0°C is 5.60  10-8Ω · m.


2. A power transmission line is hung from metal towers with glass insulators having a resistance of 4.95 ✕ 109 Ω. What current (in mA) flows through the insulator if the voltage is 220 kV? (Some high-voltage lines are DC.)
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