magnets

• Magnetic Field:

  • The region around a magnetic material or a moving electric charge within which the force of magnetism acts
  • A vector field is the neighbourhood of a magnet, electric current, or changing electric field in which magnetic forces are observable
• Properties of Magnetic Field Lines:

  • Magnetic field lines never cross each other
  • The density of the field lines indicates the strength of the field
  • Magnetic field lines always make closed loops
  • Magnetic field lines always emerge or start from the north pole and terminate at the south pole
• Electromagnetic Induction:

  • The production of electromotive current due to the disturbance of the magnetic field
  • An induced EMF occurs when there is a changing magnetic flux through a stationary conductor
• Magnetic Flux:

  • Defined as the number of magnetic field lines passing through a given closed surface
  • Provides the measurement of the total magnetic field that passes through a given surface area (the larger amount of magnetic field lines, the stronger the magnetic field of that area is)
• Right Hand Rule:

  • The thumb points towards the direction of the magnetic force
  • The forefinger points towards the direction of the magnetic field
  • The middle finger points towards the direction of the current