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 HB (a) The compass is placed on top of the wire, and it deflects 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 P, are true? There may be more than one. O At the location of the compass, the magnetic field due to the conventional current points toward the top of the page. O Electrons are moving to the left. O At the location of the compass, the magnetic field due to the conventional current points toward the bottom of the page. O Electrons are moving to the right. (b) In the steady state, 2 x 1018 electrons pass location P, every second. How many electrons pass location P, every second? (C) Which relation describes the relative brightnesses of bulbs B,, B2, and B3? O B, > B2 = B3 O B2 = B3 > BỊ O B2 < B3 < BỊ O BỊ = B2 = B3 O Bz > B3 > B1
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 HB (a) The compass is placed on top of the wire, and it deflects 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 P, are true? There may be more than one. O At the location of the compass, the magnetic field due to the conventional current points toward the top of the page. O Electrons are moving to the left. O At the location of the compass, the magnetic field due to the conventional current points toward the bottom of the page. O Electrons are moving to the right. (b) In the steady state, 2 x 1018 electrons pass location P, every second. How many electrons pass location P, every second? (C) Which relation describes the relative brightnesses of bulbs B,, B2, and B3? O B, > B2 = B3 O B2 = B3 > BỊ O B2 < B3 < BỊ O BỊ = B2 = B3 O Bz > B3 > B1
Physics for Scientists and Engineers, Technology Update (No access codes included)
9th Edition
ISBN:9781305116399
Author:Raymond A. Serway, John W. Jewett
Publisher:Raymond A. Serway, John W. Jewett
Chapter30: Sources Of The Magnetic Field
Section: Chapter Questions
Problem 30.5OQ: Two long, straight wires cross each other at a right angle, and each carries the same current I...
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Transcribed Image Text: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
P2
B,
(a) The compass is placed on top of the wire, and it deflects 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 P, are true? There may be more than one.
O At the location of the compass, the magnetic field due to the conventional current points toward the top of the page.
O Electrons are moving to the left.
O At the location of the compass, the magnetic field due to the conventional current points toward the bottom of the page.
O Electrons are moving to the right.
(b) In the steady state, 2 x 1018 electrons pass location P, every second. How many electrons pass location P, every second?
(c) Which relation describes the relative brightnesses of bulbs B1, B2, and B3?
O B1 > B2 = B3
O B2 = B3 > B1
O B, < B3 < B1
O B1 = B2 = B3
O B2 > B3 > B1
Transcribed Image Text:(d) There are 6.3 x 1028 mobile electrons per cubic meter in tungsten. The cross-sectional area of the tungsten filament in bulb B, is 0.01 mm2 (1 mm2 = 1 x 10-6 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 filament in bulb B1.
V/m
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