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© 2013 Pearson Education, Inc. A long, straight wire extends into and out of the screen. The current in the wire is A.Into the screen. B.Out of the screen.

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Presentation on theme: "© 2013 Pearson Education, Inc. A long, straight wire extends into and out of the screen. The current in the wire is A.Into the screen. B.Out of the screen."— Presentation transcript:

1 © 2013 Pearson Education, Inc. A long, straight wire extends into and out of the screen. The current in the wire is A.Into the screen. B.Out of the screen. C.There is no current in the wire. D.Not enough info to tell the direction.

2 © 2013 Pearson Education, Inc. B field of two wires

3 © 2013 Pearson Education, Inc. The magnet field at point P is A.Into the screen. B.Out of the screen. C.To the left. D.To the right. E.Zero.

4 © 2013 Pearson Education, Inc. The direction of the magnetic force on the proton is A.To the right. B.To the left. C.Into the screen. D.Out of the screen. E.The magnetic force is zero.

5 © 2013 Pearson Education, Inc. A proton is shot straight at the center of a long, straight wire carrying current into the screen. The proton will A.Go straight into the wire. B.Hit the wire in front of the screen. C.Hit the wire behind the screen. D.Be deflected over the wire. E.Be deflected under the wire.

6 © 2013 Pearson Education, Inc. The direction of the magnetic force on the electron is A.Upward. B.Downward. C.Into the screen. D.Out of the screen. E.The magnetic force is zero.

7 © 2013 Pearson Education, Inc. The horizontal wire can be levitated – held up against the force of gravity – if the current in the wire is A.Right to left. B.Left to right. C.It can’t be done with this magnetic field.

8 © 2013 Pearson Education, Inc. A bar magnet moves past an electron as shown. Then the electron at the moment shown Charge and moving magnet A. Feels no force B. Feels an upwards force C. Feels a downward force D. Feels a force out of the page E. Feels a force into the page.

9 © 2013 Pearson Education, Inc. B Field of Rings Qualitatively from Biot-Savart

10 © 2013 Pearson Education, Inc. Where is the north magnetic pole of this current loop? A.Top side. B.Bottom side. C.Right side. D.Left side. E.Current loops don’t have north poles.

11 © 2013 Pearson Education, Inc. What is the current direction in the loop? A.Out at the top, in at the bottom. B.In at the top, out at the bottom. C.Either A or B would cause the current loop and the bar magnet to repel each other.

12 © 2013 Pearson Education, Inc. The current in this solenoid A.Enters on the left, leaves on the right. B.Enters on the right, leaves on the left. C.Either A or B would produce this field.

13 © 2013 Pearson Education, Inc. The line integral of B around the loop is  0 · 7.0 A. Current I 3 is A. 0 A. B. 1 A out of the screen. C. 1 A into the screen. D. 5 A out of the screen. E. 5 A into the screen.

14 © 2013 Pearson Education, Inc. A. 0. B.  0 (I 1  I 2 ). C.  0 (I 2  I 1 ). D.  0 (I 1  I 2 ). For the path shown,

15 © 2013 Pearson Education, Inc. Solenoid 2 has twice the diameter, twice the length, and twice as many turns as solenoid 1. How does the field B 2 at the center of solenoid 2 compare to B 1 at the center of solenoid 1? A. B 2  B 1 /4. B. B 2  B 1 /2. C. B 2  B 1. D. B 2  2B 1. E. B 2  4B 1.

16 © 2013 Pearson Education, Inc. Magnetic fields deflect moving charged particles Electron beam bent into circular or helical path by magnetic field due to nearby currents.

17 © 2013 Pearson Education, Inc. At the blackboard: Coulomb's law plus special relativity explains strange cross-product rule

18 © 2013 Pearson Education, Inc. Which magnetic field causes the observed force?

19 © 2013 Pearson Education, Inc. Which magnetic field (if it’s the correct strength) allows the electron to pass through the charged electrodes without being deflected?

20 © 2013 Pearson Education, Inc. If released from rest, the current loop will A.Move upward. B.Move downward. C.Rotate clockwise. D.Rotate counterclockwise. E.Do something not listed here.


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