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For more information, please see full course syllabus of AP Physics C/Electricity and Magnetism
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Lecture Comments (3)

2 answers

Last reply by: Herve Gnidehoue
Sat Jan 7, 2012 10:45 PM

Post by Joey Cantellano on June 4, 2011

Can someone explain the section on finding flux through enclosed rectangle. I don't get why we only multiply the magnetic field by dx. Shouldn't have been dx time C

Magnetic Field Produced By Current, Part 3

  • Two parallel conductors, carrying currents, attract if the currents are parallel, and repel if the currents are antiparallel. The force is a magnetic force. Basically, one wire produces a magnetic field, which, in turn, exerts a force on the other wire.
  • Magnetic flux: If a uniform magnetic field B exists in space, then the magnetic flux through a surface, of area A, placed perpendicular to the field, is BA. If the normal to the plane surface makes an angle theta with B, then the magnetic flux through the surface is BAcos(theta). For a general case when either B is not uniform, and/or the surface is not flat, the flux is the integral of B.da over the surface.
  • Gauss’s law in magnetism: The magnetic flux through any closed surface is zero.

Magnetic Field Produced By Current, Part 3

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
  • Magnetic Force Between Parallel Conductors 0:16
    • Two Parallel Plate Capacitors with Current
    • Magnetic Field by i1
    • According to Right Hand Rule
  • Example 10:20
    • Wire of 4m Length
    • Mass of Wire 1Kg
    • Force of Repulsion =Mg
  • Gauss's Law in Magnetism 15:36
    • Surface of Area, Magnetic Field is Perpendicular to Surface
    • Magnetic Flux Through Enclosed surface
  • Example 26:44
    • Magnetic Field Out of Page
    • Consider a Flux Through Rectangular Loop
  • Example 1: Two Parallel Wires
  • Example 2: Cube with Magnetic Field