QuickCheck 29.1 If the bar magnet is flipped over and the south pole is brought near the hanging ball, the ball will be Attracted to the magnet. Repelled by the magnet. Unaffected by the magnet. I’m not sure. 2

QuickCheck 29.1 If the bar magnet is flipped over and the south pole is brought near the hanging ball, the ball will be Attracted to the magnet. Repelled by the magnet. Unaffected by the magnet. I’m not sure. 3

QuickCheck 29.2 The compass needle can rotate on a pivot in a horizontal plane. If a positively charged rod is brought near, as shown, the compass needle will Rotate clockwise. Rotate counterclockwise. Do nothing. I’m not sure. 4

QuickCheck 29.2 The compass needle can rotate on a pivot in a horizontal plane. If a positively charged rod is brought near, as shown, the compass needle will Rotate clockwise. Rotate counterclockwise. Do nothing. I’m not sure. Magnetic poles are not the same as electric charges. Slide 29-29 5

QuickCheck 29.3 If a bar magnet is cut in half, you end up with 6

QuickCheck 29.3 If a bar magnet is cut in half, you end up with 7

QuickCheck 29.4 A long, straight wire extends into and out of the screen. The current in the wire is Into the screen. Out of the screen. There is no current in the wire. Not enough info to tell the direction. 8

QuickCheck 29.4 A long, straight wire extends into and out of the screen. The current in the wire is Into the screen. Out of the screen. There is no current in the wire. Not enough info to tell the direction. Right-hand rule 9

QuickCheck 29.5 What is the direction of the magnetic field at the position of the dot? Into the screen Out of the screen Up Down Left 10

QuickCheck 29.5 What is the direction of the magnetic field at the position of the dot? Into the screen Out of the screen Up Down Left 11

QuickCheck 29.6 Compared to the magnetic field at point A, the magnetic field at point B is Half as strong, same direction. Half as strong, opposite direction. One-quarter as strong, same direction. One-quarter as strong, opposite direction. Can’t compare without knowing I. 12

QuickCheck 29.6 Compared to the magnetic field at point A, the magnetic field at point B is Half as strong, same direction. Half as strong, opposite direction. One-quarter as strong, same direction. One-quarter as strong, opposite direction. Can’t compare without knowing I. 13

QuickCheck 29.7 The magnet field at point P is Into the screen. Out of the screen. Zero. 14

QuickCheck 29.7 The magnet field at point P is Into the screen. Out of the screen. Zero. 15

QuickCheck 29.8 Where is the north magnetic pole of this current loop? Top side. Bottom side. Right side. Left side. Current loops don’t have north poles. 16

QuickCheck 29.8 Where is the north magnetic pole of this current loop? Top side. Bottom side. Right side. Left side. Current loops don’t have north poles. 17

QuickCheck 29.9 What is the current direction in the loop? Out at the top, in at the bottom. In at the top, out at the bottom. Either A or B would cause the current loop and the bar magnet to repel each other. 18

QuickCheck 29.9 What is the current direction in the loop? Out at the top, in at the bottom. In at the top, out at the bottom. Either A or B would cause the current loop and the bar magnet to repel each other. 19

QuickCheck 29.10 The line integral of B around the loop is μ0 ∙ 7.0 A. Current I3 is 0 A. 1 A out of the screen. 1 A into the screen. 5 A out of the screen. 5 A into the screen. 20

QuickCheck 29.10 The line integral of B around the loop is μ0 ∙ 7.0 A. Current I3 is 0 A. 1 A out of the screen. 1 A into the screen. 5 A out of the screen. 5 A into the screen. 21

QuickCheck 29.11 For the path shown, μ0(I1 – I2) μ0(I2 – I1) μ0(I1 – I2) μ0(I2 – I1) μ0(I1 + I2) 22

QuickCheck 29.11 For the path shown, μ0(I1 – I2) μ0(I2 – I1) μ0(I1 – I2) μ0(I2 – I1) μ0(I1 + I2) 23

QuickCheck 29.12 Solenoid 2 has twice the diameter, twice the length, and twice as many turns as solenoid 1. How does the field B2 at the center of solenoid 2 compare to B1 at the center of solenoid 1? B2 = B1/4 B2 = B1/2 B2 = B1 B2 = 2B1 B2 = 4B1 24

QuickCheck 29.12 Solenoid 2 has twice the diameter, twice the length, and twice as many turns as solenoid 1. How does the field B2 at the center of solenoid 2 compare to B1 at the center of solenoid 1? B2 = B1/4 B2 = B1/2 B2 = B1 B2 = 2B1 B2 = 4B1 Same turns-per-length 25

QuickCheck 29.13 The current in this solenoid Enters on the left, leaves on the right. Enters on the right, leaves on the left. Either A or B would produce this field. 26

QuickCheck 29.13 The current in this solenoid Enters on the left, leaves on the right. Enters on the right, leaves on the left. Either A or B would produce this field. 27

QuickCheck 29.14 The direction of the magnetic force on the proton is To the right. To the left. Into the screen. Out of the screen. The magnetic force is zero. 28

QuickCheck 29.14 The direction of the magnetic force on the proton is To the right. To the left. Into the screen. Out of the screen. The magnetic force is zero. 29

QuickCheck 29.15 The direction of the magnetic force on the electron is Upward. Downward. Into the screen. Out of the screen. The magnetic force is zero. 30

QuickCheck 29.15 The direction of the magnetic force on the electron is Upward. Downward. Into the screen. Out of the screen. The magnetic force is zero. 31

QuickCheck 29.16 Which magnetic field causes the observed force? 32

QuickCheck 29.16 Which magnetic field causes the observed force? 33

QuickCheck 29.17 Which magnetic field (if it’s the correct strength) allows the electron to pass through the charged electrodes without being deflected? 34

QuickCheck 29.17 Which magnetic field (if it’s the correct strength) allows the electron to pass through the charged electrodes without being deflected? 35

QuickCheck 29.18 A proton is shot straight at the center of a long, straight wire carrying current into the screen. The proton will Go straight into the wire. Hit the wire in front of the screen. Hit the wire behind the screen. Be deflected over the wire. Be deflected under the wire. 36

QuickCheck 29.18 A proton is shot straight at the center of a long, straight wire carrying current into the screen. The proton will Go straight into the wire. Hit the wire in front of the screen. Hit the wire behind the screen. Be deflected over the wire. Be deflected under the wire. v ×B points out of the screen 37

QuickCheck 29.19 The horizontal wire can be levitated—held up against the force of gravity—if the current in the wire is Right to left. Left to right. It can’t be done with this magnetic field. 38

QuickCheck 29.19 The horizontal wire can be levitated—held up against the force of gravity—if the current in the wire is Right to left. Left to right. It can’t be done with this magnetic field. 39

QuickCheck 29.20 If released from rest, the current loop will Move upward. Move downward. Rotate clockwise. Rotate counterclockwise. Do something not listed here. 40

QuickCheck 29.20 If released from rest, the current loop will Move upward. Move downward. Rotate clockwise. Rotate counterclockwise. Do something not listed here. Net torque but no net force 41