Current in a series circuit Consider the circuit containing three identical ligh

Question

Current in a series circuit Consider the circuit containing three identical light bulbs shown in a top view in the figure. North is indicated in the diagram. Compasses are placed under the wires at locations A and B. i zero megnitude a) The magnitude of the deflection of compass A is 10 degrees away from north. Which arrow best indicates the direction in which the compass needle points? (b) What is the magnitude of the deflection of the needle of compass B? 10degrees What direction does the needle of compass B point? (c) In the steady state 1.2 x 1018 electrons per second enter bulb 1. There are 6.3 x 1028 mobile electrons per cubic meter in tungsten. The cross-sectional area of the tungsten filament in bulb 1 is 1 x 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 nament in bulb 3. 15.87 V/m

Explanation / Answer

a) h arrow

indicates the direction in which this compass need points

b) needle of the compass = 10 degrees

current and magnetic fields are same as both bulbs are connected in series

c) E = I / n A mu

= (1.2 * 1018) / (6.3 * 1028 * 1 * 10-8 * 1.2 * 10-4)

magnitude of electric field = 15.87 V/m

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