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Magnetic Force and Motors

Magnetic Force and Motors. Physics 12. Joke of the day:. Special song clip of the day:. Featuring Canadian ISS commander: Chris Hadfield! http://www.wimp.com/singscollaboration/. Review:. page 767 # 1, 2 Remember RHR#1

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Magnetic Force and Motors

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  1. Magnetic Force and Motors Physics 12

  2. Joke of the day:

  3. Special song clip of the day: • Featuring Canadian ISS commander: Chris Hadfield! • http://www.wimp.com/singscollaboration/

  4. Review: • page 767 # 1, 2 • Remember RHR#1 • Thumb of your right hand pointing in the direction currentand your fingers will wrap around the conductor in the direction of the induced magnetic field.

  5. X 1 (a) Current Coming Towards You Current Moving Away From You

  6. 1 (b): note how the two magnetic fields combine to create one big loop on the outside • Both currents flowing towards viewer

  7. 1(c): North • One current towards viewer and other current going away from viewer X South

  8. Solenoids RHR#2

  9. Loops of Wire: If the wire is shaped into a single loop, using RHR1, the behaviour of the magnetic field can be visualized

  10. Solenoid: • If the wire is formed into many loops, a solenoid is created • And if we wrap a wire into several coils (and usually around a soft iron core) we create a solenoid that is also an electromagnet • Advantages of electromagnets: • The strength of an electromagnet can easily be changed by changing the amount of electric current that flows through it. • The poles of an electromagnet can even be reversed by reversing the flow of electricity.

  11. Right Hand Rule #2: • Gives the direction of the North Pole in a solenoid • Fingers curl in direction of current • Thumb points to N pole

  12. Force Experienced by Charged Particle in a Magnetic Field

  13. Review: What is current? • I = q_ Δt • It is a flow of electric charge. • Is carried by moving electrons in a wire! • Hmmmm….moving electrons….so they have velocity!

  14. What does this remind you of? • Pipe cleaner time again! • X represents magnetic field into the board • Let’s think about directions: • Velocity initially is…. • To the right • Field into the board • What direction does the force have to be acting in? • Up or down • Oh no we’re in 3D now!

  15. Charged Particle in Magnetic Field: • The force acting on the charged particle is proportional to speed and charge • Magnitude and direction of force depend on velocity of particle as well as magnitude and direction of magnetic field

  16. When particle moves parallel to field, zero force experienced • Force acts perpendicularly to both velocity and field

  17. RHR #3/ LHR#3: • Use to determine the direction of the force when the current and magnetic field are known • Thumb = force • Index = magnetic field • Middle = current

  18. Right vs Left: • Use right hand if positive charge and left hand if negative charge Left Right

  19. Video clip: • http://www.youtube.com/watch?v=HTTA30sEv6o

  20. Practise:

  21. Try it : • Practise sheet • Work on lab 

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