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Magnetic Fields in Wires

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Magnetic Fields in Wires Strength of Magnetic Field Strength of the magnetic field produced by a current carrying wire is directly proportional to the amount of ... – PowerPoint PPT presentation

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Title: Magnetic Fields in Wires


1
Magnetic Fields in Wires
2
Strength of Magnetic Field
  • Strength of the magnetic field produced by a
    current carrying wire is directly proportional to
    the amount of current
  • Inversely proportional to distance from the wire
    (r)
  • Varies by a constant ?o/2?
  • ?o permeability of free space
  • 4? x 10-7

3
Equation
  • B (?o/2?) (I / r)

4
Example
  • A vertical wire carries a current of 25 A up.
    What is the magnitude and direction of the field
    at a point 10cm to the right of the wire?

5
Forces Between 2 Wires
  • Since wires produce magnetic fields when a
    current is applied, two current carrying wires
    will either attract or repel

6
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7
Current In Same Direction
  • Wires attract

8
Currents in Opposite Directions
  • Wires repel

9
Forces Between Wires
  • F/ l (?o/2?) ( I1I2/ L)
  • l length of wires
  • L distance between wires

10
Example
  • Two wires of a 2.0 m long appliance cord are
    3.0mm apart and carry a current of 8.0A. What is
    the force between the wires?

11
Example
  • A horizontal wire carries a current of 80A. A
    second wire 20cm below it must carry a current I2
    so that it doesnt fall due to gravity, what is
    this current? The lower wire has a mass of .12g
    per meter.
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