A uniform and constant magnetic field ` vec(B) = (20 vec(i) - 30 vec(j) + 50 vec(k))` tesla exists in space . A charged particle with charge to mass ratio ` ((q)/(m)) = (10^(3))/( 19) C` / kg enters this region at time t = 0 with a velocity `vec (V) = (20 vec(i) + 50 vec(j) + 50 vec(j) + 30 vec(k))` m/s . Assume that the charged particle always remains in space having the given magnetic field (Use `sqrt(2) = 1.4` )
During the further motion of the particle in the magnetic field , the angle between the magnetic field `vec(B)` and velocity of the particle is

Options

A. remains constant
B. increases
C. decreases
D. may increase or decrease.

Answer

A