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HW7 due on Friday Turn in HW6 Stand by to receive back HW5 EXAM 2 coming up on Monday !!!!! March 30 th
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
Example: Suppose a cable is carrying 100 A current. What’s the B-field 1 cm from the cable? How about 10 cm?
Example: The cables are each carrying 25 A out the of page. What’s at point Q? 13.0 cm Q
Example: The cables are carrying 25 A out the of page. What’s at point P? Superposition! Next … 13.0 cm P
P Example: The cables are each carrying 25 A out the of page. What’s at point Q?
P Now: Vector Superposition! Next …
Example: The cables are each carrying 25 A out the of page. What’s at point Q?
Forces between current-carrying conductors
Opposite Currents Repel!
Parallel Currents attract! (same magnitude as other case!)
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?
What about currents perpendicular to each other? …
Fun example: Force/m?
Fun example: How much current do you need in the third wire so the net forces are zero?
Current Loop: up/out down/in Solenoids
Current LoopS: up/out down/in
Solenoid: up/out down/in
Example: What’s the B-field inside a coil with 50 turns/cm, running a current of 2 A?
Magnetism and Currents. A current generates a magnetic field. A magnetic field exerts a force on a current. Two contiguous conductors, carrying currents,
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Copyright © 2007, Pearson Education, Inc., Publishing as Pearson Addison-Wesley. Magnets and the magnetic field Electric currents create magnetic fields.
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