# Each battery has an emf of 1.3 volts_ The length of the tungsten filament in each bulb is 0.011 m_

###### Question:

Each battery has an emf of 1.3 volts_ The length of the tungsten filament in each bulb is 0.011 m_ The radius of the filament is Se-6 m (it is very thinl). The electron mobility of tungsten is 1.8e-3 (m/s)/(VIm). Tungsten has 6e+28 mobile electrons per cubic meter: Since there are three unknown quantities, we need three equations relating these quantities_ Use any two valid energy conservation equations and one valid charge conservation equation to solve for the following electric field magnitudes: What is the magnitude of the electric field inside bulb #1? 157.58 Vlm What is the magnitude of the electric field inside bulb #2? 78.79 Vlm How many electrons per second enter bulb #1? 6.68e17 electrons/s How many electrons per second enter bulb #27 3.34e17 electrons/s

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