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In the steady state 1.8 1018 electrons per second enter bulb 1. There are 6.3 1028 mobile electrons per cubic meter in tungsten. The cross-sectional area of the tungsten filament in bulb 1 is 1 10-8 m2. The electron mobility in hot tungsten is 1.2 10-4 (m/s)/(N/C). Calculate the magnitude of the electric field inside the tungsten filament in bulb 3. V/m

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