1Tesla

1Tesla is 1N of force which exerts on coulomb of charge of 1C which moves in velocity of 1m/s in the magnetic field perpendicularly.

1 Tesla = NA m/s.

1gauss

1gauss is defined as 1dyne of force which exerts on a charge of 1emu which moves in velocity of 1cm/s in the magnetic field perpendicularly.

1 gauss = 1dyne(1emu×1cm/s)

Conversion of tesla to gauss

1Tesla = 1N /(1C * 1m/s)

We know that

1N = 10 ⁵ dyne

1C = 10 ^-1 emu

1m/s = 10 ² cm/s

1Tesla = 10 ⁵ dyne/(10 ^-1 emu*10 ² cm/s)

1Tesla = 10 ⁴ dyne/(emu*cms)

1Tesla = 10 ⁴ gauss