Electromagnetism

Electromagnetism

Magnetic Fields
1. Region of space where magnetic forces can be felt
2. Magnetic Field Lines
  1. Indicates the direction a 'magnetic north' would travel in a magnetic field if free to do so
  2. Connect the north and south pole of a magnet
Magnetic Flux Density (B)
1. Strength of the magnetic field
2. Vector quantity
3. Tesla
Forces in a magnetic field
1. Force on a current-carrying conductor in a magnetic field
  1. F = IlB
    1. F = force
    2. I = current
    3. l = length
    4. B = magnetic flux density
  2. When the flow of current in the conductor is perpendicular to the magnetic field
  3. Direction
    1. Fleming's left hand rule
2. Force on a charged particle moving through a magnetic field
  1. F = qvB
    1. q = charge
    2. v = velocity
    3. B = magnetic flux density
3. Forces between currents
  1. Definition of the Ampere is based on this principle
Electromagnetic Induction
1. Faraday's Law
  1. Magnitude of the induced emf is proportional to the rate of change of magnetic flux linking a circuit
2. Magnetic flux (Φ)
  1. Φ = BA
    1. B = magnetic flux density
    2. A = area
  2. Vector quantity
  3. Weber (Wb)
3. Lenz's Law
  1. Direction of the induced emf always opposes the charge causing it
4. Mutual Induction
  1. Transformer
5. Self-induction
  1. Inductor

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