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Magnetic field due to a long (straight) wire:

Magnetic field due to a long (straight) wire:. Let’s review:. current on ( I up ! ). Right hand rule (#1). ( I up/out ! ). DIRECTION-OK MAGNITUDE???. Experiment shows: For a long straight wire.

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Magnetic field due to a long (straight) wire:

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  1. Magnetic field due to a long (straight) wire: Let’s review:

  2. current on ( Iup !).

  3. Right hand rule (#1)

  4. ( Iup/out !). DIRECTION-OK MAGNITUDE???

  5. Experiment shows: For a long straight wire

  6. Example: Suppose a cable is carrying 100 A current. What’s the B-field 1 cm from the cable? How about 10 cm?

  7. Example: The cables are each carrying 25 A out the of page. What’s at point Q? 13.0 cm Q

  8. Example: The cables are carrying 25 A out the of page. What’s at point P? 13.0 cm P 13.0 cm Individuals here, Total …..

  9. Example: The cables are carrying 25 A out the of page. What’s at point P? P 13.0 cm 13.0 cm Individuals here, Total …..

  10. Example: The cables are carrying 25 A out the of page. What’s at point P? 13.0 cm P 13.0 cm

  11. Forces between current-carrying conductors

  12. Opposite Currents Repel!

  13. Parallel Currents attract! (same magnitude as other case!)

  14. Example: What force per unit length do two cables 1 cm apart produce on each other? (They’re carrying 50 A each.) How about at 10 cm?

  15. What about currents perpendicular to each other?

  16. What about currents perpendicular to each other?

  17. Fun example: Force/m?

  18. Fun example: How much current do you need in the third wire so the net forces are zero?

  19. Solenoids down/in Current Loop: up/out

  20. Current LoopS: down/in up/out

  21. Solenoid: down/in up/out

  22. WRENCH DEMO

  23. Example: What’s the B-field inside a coil with 50 turns/cm, running a current of 2 A?

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