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For more information, please see full course syllabus of AP Physics B
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Magnetic Field Produced by Currents

  • A long, straight wire carrying a current I, produces a magnetic field, whose value at a distance r from the wire, is (mu_0) I / 2(pi)r, where (mu_0) is called the permeability of free space, and in SI units, its value is 4(pi)x10^-7 T.m/A. The direction of the magnetic field is determined by the right hand rule: place the thumb of your right hand along the direction of the current, and the four fingers will then be in the direction of the field.
  • Two parallel wires carrying currents exert forces on each other. If the currents are parallel, the force will be attractive, and if they are anti-parallel the force will be repulsive.

Magnetic Field Produced by Currents

Lecture Slides are screen-captured images of important points in the lecture. Students can download and print out these lecture slide images to do practice problems as well as take notes while watching the lecture.

  • Intro 0:00
  • Long Straight Wire 0:49
    • Long Wire Connect to Battery (Imaginary Plane)
    • Introducing a Compass
    • Amperes Law/Biot-Savart law
    • Wire With Current I
    • Magnetic Permeability of Free Space
  • Example 13:22
    • Wire With Current 5 Amps
    • Calculation Magnetic Field Produced By Wire
  • Magnetic Force Between Parallel Current Carrying Wire 21:34
    • Two Wires Carrying Curren
    • Calculating Force of Attraction
    • Magnetic Field B Produced by First Wire
    • Force on Second Wire
  • Example 33:59
    • Wire on Ground
    • Another Wire
    • Magnetic Force on Wire 2
  • Coils 41:16
    • Circular Loop
    • Magnetic Field is Not Uniform
    • Magnetic Field at Center
    • Solenoid
    • Wire of length L in Coil with a Battery
  • Extra Example 1: Two Parallel Wires
  • Extra Example 2: Magnetic Field of Wires