GCSE Combined Science (AQA)

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Magnetic Flux Density

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Magnetism and electromagnetism The motor effect

Magnetic Flux Density

2:29 The Motor Effect
Spec 4.7.2.2
Previous Magnetic Field Around a Solenoid Next Fleming's Left-Hand Rule
  • Magnetic flux density measures the strength of a magnetic field.
  • Field strength can be judged by the field pattern; more field lines indicate a stronger field.
  • High magnetic flux density corresponds to strong fields, low density to weaker fields.
  • Magnetic flux density provides a numeric value for field strength, useful for calculating magnetic forces.
  • Symbol for magnetic flux density: B.
  • Unit for magnetic flux density: Tesla (T).
  • Example: Near a bar magnet's pole, flux density is approximately 10^-3 Teslas.
  • Earth's weakest field at the equator has a flux of around 10^-5 Teslas.
  • A bar magnet's field can override Earth's field, affecting compass direction.
  • Human brain's magnetic field is very weak, around 10^-12 Teslas.
  • Understanding expected values for flux densities helps differentiate weak and strong fields.

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