Three bulbs The figure is a top view of a circuit containing three identical light bulbs (the rest of the circuit including the batteries is not shown). The direction of the North pole is toward the right. The connecting wires are made of copper. North (a) The compass is placed on top of the wire, and it deects 20 degrees away from north as shown (the wire is underneath the compass). Which of the following statements about the magnetic field caused by the electrons moving at location P1 are true? There may be more than one. C] Electrons are m0ving to the right. C] At the location of the compass, the magnetic field due to the conventional current points toward the bottom of the page. C] At the location of the compass, the magnetic field due to the conventional current points toward the top of the page. C] Electrons are moving to the left. (b) In the steady state, 4 x 1018 electrons pass location P1 every second. How many electrons pass location P2 every second? E (c) Which relation describes the relative brightnesses of bulbs Bl, 32: and B3? 0 52 > B3 > Bl OBl>B2=B3 OBzBl (cl) There are 5.3 x 1023 mobile electrons per cubic meter in tungsten. The crass-sectional area of the tungsten lament in bulb 31 is 0.01 mm2 (1 mm2 = 1 x 10-5 m2). The electron mobility in hot tungsten is 1.2 x 10-4 (m/s)/(N/C). Calculate the magnitude of the electric field inside the tungsten lament in bulb Bl. IEI = :1 Wm