The SI unit of magnetic flux density, named after Nicola Tesla.
1T is equal to 1 weber per square meter in the mks (meter-kilogram-second) system .
The average magnetic field strength of the earth is 0.00005 T or 0.5 G
This natural static magnetic fiels varies geographically from ~30 to 70µT
A long straight wire carrying 100 A of current produces a magnetic field of 0.001 T (10 G) at a distance of 2 cm from the wire.
The CGS unit of magnetic flux density is the gauss (G), 1 tesla (T) = 10000 gauss (G).