Question

define 1 tesla using the expression for the magnetic force acting on a particle of charge Q moving with velocity V vector in a magnetic field b vector

Answer 1

Tesla = force
F = V*Q*B

Answer 2

Hey !!

One tesla is the magnetic field in which a charge of 1 C moving with a velocity of 1 ms⁻¹, normal to the magnetic field, experiences a force of 1 N.

               B = F / qv sin θ

If  F = 1 N , q = 1 C

     v = 1 ms⁻¹

      θ = 90°

The SI unit of B = 1 N / 1 C. 1ms⁻¹ . sin 90°

           = 1 NA⁻¹ m⁻¹ = 1 tesla

GOOD LUCK !!