That is, a static magnetic field changes the direction of the velocity but does not affect the speed or kinetic energy of the charge particle. From Eq. (1) the unit of Bmust be the same as the unit of F/qv, and the SI unit of Bis equivalent to Ns/Cm; where 1 Ns/Cm = 1 N/Am = 1 T, (3) where A is the SI unit of current (1 A = 1 C/s), and T is tesla, the unit in honor of Nikola Tesla (1857