Another way to look at this is that the magnetic force is always perpendicular to velocity, so that it does no work on the charged particle. The particle’s kinetic energy and speed thus remain constant. The magnetic force is perpendicular to the velocity, so velocity changes in direction but not magnitude.

That rule describes how a charged particle (our electron) moving in a magnetic field will be deflected by that field at a right angle to both the field and to the direction of the particle. The electrons in the cathode rays would deflect toward the positively charged plates, and away from the negatively charged plates.

Magnetic Force The force is perpendicular to both the velocity v of the charge q and the magnetic field B. This implies that the magnetic force on a stationary charge or a charge moving parallel to the magnetic field is zero. 3. The direction of the force is given by the right hand rule.

The velocity component perpendicular to the magnetic field creates circular motion, whereas the component of the velocity parallel to the field moves the particle along a straight line. The pitch is the horizontal distance between two consecutive circles. The resulting motion is helical.

Circular motion in a magnetic field. Charged particles in a magnetic field feel a force perpendicular to their velocity. Since the force is F = qvB in a constant magnetic field, a charged particle feels a force of constant magnitude always directed perpendicular to its motion. The result is a circular orbit.

Magnetic field lines always follow a closed path. That is, they are always loops.

The electron follows a circular path, the magnetic force being the unbalanced force required to cause acceleration towards the centre of the circle. The radius of the circular path is proportional to the speed of the electron.

The electron travels in circular orbits around the nucleus. The orbits have quantized sizes and energies. Energy is emitted from the atom when the electron jumps from one orbit to another closer to the nucleus.

So, if an electron ( obviously a charged object) would be doing a circular motion around a nucleus, the direction of its velocity would be changing, therefore it would radiate out energy, therefore it would loose energy, which means it would spiral down to the nucleus.