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(unit of magnetic flux density)

A tesla (T) is the SI unit of magnetic field strength or magnetic flux density (B). It is defined as a weber per square meter. A particle carrying a charge of one coulomb passing perpendicularly through a magnetic field of one tesla at a speed of one meter-per-second experiences a force of one newton.

1 tesla equals 10,000 gauss, the CGS unit measuring the same physical property.

Further reading:

Referenced by pages:
gauss (G)
interstellar magnetic field (ISMF)
magnetic flux density (B)