Q - Write the expression for the force acting on a charged particle of charge (q) moving with a velocity (v) in the presence of magnetic field (B). show that in presence of this force :
(i) the Kinetic Energy of particle does not change.
(ii) Instantaneous power is zero.
Force experienced by the charged particle is given by:
F = q (v X B)
Work done by this force is zero. As the direction of force is along the direction of displacement.
=> Since there is no work done, that means the kinetic energy remains the same.
Power = F.v
=q(v X B).v
= 0
The instantaneous power is zero.