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There are 6.3 multiplied by 1028 mobile electrons per cubic meter in tungsten. The cross-sectional area of the tungsten filament in bulb B1 is 0.01 mm2 (1 mm2 = 1 multiplied by 10-6 m2). The electron mobility in hot tungsten is 1.2 multiplied by 10-4 (m/s)/(N/C). Calculate the magnitude of the electric field inside the tungsten filament in bulb B1.

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