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Tesla (T)

Quantity: Magnetic flux density · Category: Derived SI

The tesla is the SI unit of magnetic flux density (magnetic field strength). One tesla is one weber of magnetic flux per square metre — a very strong field.

Relation to SI

1 T = 1 Wb/m² = 1 N/(A·m) = 1 kg/(A·s²)

Examples

  • Earth's magnetic field is about 50 microtesla.
  • A fridge magnet is around 5 millitesla.
  • Hospital MRI scanners use 1.5–3 tesla fields.