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Electromagnetic Force

Electromagnetic Force. Force on a Charged Particle. F= Bqv F=force (N) B= Magnetic field q= charge (C) N/Amp∙m or velocity (m/s) Tesla. EXAMPLE.

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Electromagnetic Force

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  1. Electromagnetic Force

  2. Force on a Charged Particle F= Bqv F=force (N) B= Magnetic field q= charge (C) N/Amp∙m or velocity (m/s) Tesla

  3. EXAMPLE An electron travels at a speed of 3x106m/s through a magnetic field of 4x10-2 Tesla. How much force is acting on the electron? F=Bqv F= (4x10-2T)(1.6x10-19C)(3x106m/s) F= 1.9x10-14N

  4. Force on a Wire With Current F=BIL F- force(N) B- Magnetic Field I-current(amps) (N/A∙m) orTesla L-length(m)

  5. Example A wire 1.0m long carries 0.50amps of current. If the force acting on the wire is 0.2N, what is the magnetic field strength the wire experiences? F=BIL 0.20N = B(0.5Amp)(1.0m) B = 0.40 N/A∙m

  6. B = 0.4N/A∙m I S N F =0.20N

  7. Alternating current- Current that reverses direction due to a force and a magnetic field acting on a wire. F *Use right hand rule B F S N C A F D F Point (A)- Current is outward Points (B) and (D)- no current, force is parallel to field Point (C)-Current is into the wire

  8. Graphing Alternating Current IMax A A B B D t 0 D -I max C C *Commercial frequency is 60Hz so current changes direction 120 times per second!

  9. Diode- Converts AC to DC by limiting the direction of the current flow I t

  10. Graphing Direct Current I max t Doesn’t change direction

  11. Generator-Rotating loop in a magnetic field that produce a current. Current changes direction every ½ cycle (AC). F An outside force causes the wire loop to rotate inside a magnetic field. The current changes direction due to the loop in the wire. F

  12. Motor-Uses a current in a magnetic field to generate a force. This force allows work to be done by the motor.

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