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Magnetic Fields Produced by Currents

Magnetic Fields Produced by Currents. February 14, 2007. I. r. B. Long, straight wire. Moving Charges Produce Magnetic Fields. “moving charges” = “current”. Right hand rule for currents (RHR-2): Thumb in direction of current, fingers curl in direction of B-field. RHR-1: Fingers along B

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Magnetic Fields Produced by Currents

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  1. Magnetic Fields Produced by Currents February 14, 2007

  2. I r B Long, straight wire Moving Charges Produce Magnetic Fields • “moving charges” = “current” Right hand rule for currents (RHR-2): Thumb in direction of current, fingers curl in direction of B-field.

  3. RHR-1: Fingers along B Thumb along v Palm shows F I2 L I1 (eqn 21.3 in book) Example: Two Wires (opposite directions) r

  4. RHR-1: Fingers along B Thumb along v Palm shows F I2 L I1 (eqn 21.3 in book) Example: Two Wires (same direction) r

  5. Current I Loop of Wire (N=1 turn) RHR-2 Thumb along current I Fingers curl along B B Loop with N Turns:

  6. Adding Loops of Wire (same radius) Loop with N Turns X 1 X 2 X 3 X 4

  7. The Solenoid L B I I Similar (but not exactly the same) to adding N turns of wire with equal radius: But let’s just call B-field through solenoid

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