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# Announcements

Announcements. Homework for tomorrow… (Ch. 32, CQ 9, Probs . 34 &amp; 48) 32.8: 2.5A, 250A, 5.0 x 10 3 - 5.0 x 10 4 A, 5.0 x 10 5 A 32. 11 : a) 20 A b) 1.6 x 10 -3 m 32.14: a) (6.7 x 10 -5 T) khat b ) –(2.0 x 10 -4 T) khat c) (6.7 x 10 -5 T) khat Office hours…

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## Announcements

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### Presentation Transcript

1. Announcements • Homework for tomorrow… (Ch. 32, CQ 9, Probs. 34 & 48) 32.8: 2.5A, 250A, 5.0 x 103 - 5.0 x 104 A, 5.0 x 105 A 32.11: a) 20 A b) 1.6 x 10-3 m 32.14: a) (6.7 x 10-5 T) khat b) –(2.0 x 10-4 T) khat c) (6.7 x 10-5 T) khat • Office hours… MW 12:30-1:30 pm TR 9-10 am F 10-11 am • Tutorial Learning Center (TLC) hours: M 8-1 pm, 3-6 pm, W 8-1 pm, 2-6 pm TR 8-6 pm, F 8-2 pm

2. Chapter 32 The Magnetic Field (The Magnetic Force on a Moving Charge & on a Current-Carrying Wire)

3. Review… The B-field of a current loop of radius R carrying a current I, when z >>R… Force on a charged particle with a velocity v in a B-field …

4. Cyclotron Motion Consider a charged particle moving perpendicular to a uniformB-field… • Since F is perpendicular to v, the charge particle undergoes uniform circular motion. The radius of the orbit is… The frequency of revolution is…

5. Cyclotron Motion Consider a charged particle moving perpendicular to a uniformB-field… • Since F is perpendicular to v, the charge particle undergoes uniform circular motion. The radius of the orbit is… The frequency of revolution is…

6. i.e. 32.11: The radius of cyclotron motion In the figure below, an electron is accelerated from rest through a potential difference of 500 V, then injected into a uniform B-field. Once in the B-field, it completes half a revolution in 2.0 ns. What is the radius of its orbit?

7. Cyclotron Motion What if v is NOT perpendicular to B? The component of v parallel to B is NOT affected by the field. The component of vperpendicular to B determines the radiusof the helix.

8. Aurora

9. Quiz Question 1 Which B-field (if it’s the correct strength) allows the electron to pass through the charged electrodes without being deflected?

10. 32.8: Magnetic Forces on Current-Carrying Wires Consider a current-carrying wire perpendicular to the B-field… Each charge in the current has a force of magnitude qvB directed to the left. What is the force on the wire?

11. 32.8: Magnetic Forces on Current-Carrying Wires Consider a current-carrying wire perpendicular to the B-field… Each charge in the current has a force of magnitude qvB directed to the left. What is the force on the wire? Magnitude: Direction: RHR

12. Quiz Question 2 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.

13. Force Between Two Parallel Wires What is the force on wire1 due to wire2?

14. Force Between Two Parallel Wires What is the force on wire1 due to wire2?

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