1. 8.5 – Applications of Electric and Magnetic Fields
CH 8: Magnetic Fields
8.5 – Applications of Electric and Magnetic Fields

2. Agenda
Quiz
Lesson on Section on 8.5
Lots of Video’s
Story Time

3. Cyclotron Particle Accelerator
TRIUMF National laboratory in Vancouver has the largest cyclotron at 18m

4. Use of Magnetic Fields in Cyclotrons
Particles moving in a cyclotron are subjected to a uniform magnetic field which causes the particles to move in a circular path.
Each time the charged particle enters a Dee it follows a semi-circular path and each time it traverses to the other Dee its speed is greater than before as it is subjected to an Electric field. Its energy has increased by W=qV.

5. Use of Magnetic Fields in Cyclotrons
The period of the charged particle is independent of its speed, this can be shown by the following,

6. Use of Magnetic Fields in Cyclotrons
The Kinetic Energy can be found by,

7. Use of Magnetic Fields in Cyclotrons
Example,
A cyclotron is used to accelerate dueterons (q = 1.6 x 10-19C) of mass 3.34 x kg. The radius of the cyclotron is 30cm and the magnetic field applied to it has strength 1.6T. Find
The period of the particles in their circular path.
The energy (in eV) of the particles leaving the cyclotron.

8. Use of Magnetic Fields in Cyclotrons
The period of the particles in their circular path.

9. Use of Magnetic Fields in Cyclotrons
(b) The energy (in eV) of the particles leaving the cyclotron.

10. Life without Electricity

11. Motors and Generators

12. DC Motors

13. RFID Chips (Radio-Frequency Identification Technology)
Technology that uses microchips that act as a transmitters and responders to communicate data by radio waves

15. Magneto-rheological Fluid (MR Fluid)
A fluid containing suspended iron particles that, when subjected to a magnetic field, changes to a solid
Changes state from solid to liquid and back using a magnetic field

16. MR Fluid Dampers http://www.youtube.com/watch?v=SBXQ-6uI8GY
When in liquid form, can absorb shockwaves and reduce potential damage such as during Earthquakes
Used in:
Shock absorbers
Washing Machines
Prosthetics
Exercise Equipment

17. High-Voltage Power Lines

18. MRI (Magnetic Resonance Imaging)
Hydrogen atoms in the body align themselves either in the direction of or opposite to the magnetic field
MRI device sends a regularly repeating radio frequency pulse, which causes the atoms to emit a regular energy signal which is detected by the scanner

20. Homework pg. 409 #10 research the topic
answer the question in 250 words or less
(include 1-2 APA sources/references)
Hand in tomorrow