00:01
The magnetic force is equaling the charge multiplied by the velocity vector cross product with the magnetic field vector.
00:12
And so essentially we can say, we also know that the formula for work is equaling the change in the kinetic energy.
00:21
And so why can't a magnetic field do work on electrons? and we know that it's because the direction of the force, we can say direction of the force acting on the electrons is always perpendicular to the plane containing, we can say, vectors velocity and b, the magnetic field vector.
01:04
And so we can say that here, the force acting on the, the beam, because it's always perpendicular to the direction, to the velocity vectors, we can say that it's always perpendicular to the velocity vector of the charge particle q.
01:26
And so essentially, no component of the force acts along the direction of the motion of the particle...