Is work done by magnetic force?

The magnetic field does no work, so the kinetic energy and speed of a charged particle in a magnetic field remain constant. The magnetic force, acting perpendicular to the velocity of the particle, will cause circular motion.

Why magnetic fields never do work on moving charges?

One basic feature of magnetism is that, in the vicinity of a magnetic field, a moving charge will experience a force. Interestingly, the force on the charged particle is always perpendicular to the direction it is moving. Hence magnetic forces do no work on charged particles and cannot increase their kinetic energy.

Why do we not feel a gravitational attraction to the objects around us?

Because your mass is so much less than the mass of the Earth, you can’t feel your gravitational force. Because the Earth’s gravity has the same pull on every object, all objects fall at the same speed (in a vacuum). On Earth, we have air. Air resistance will cause some objects to fall more slowly than others will.

Why can’t a constant uniform magnetic field do work on a point particle?

The magnetic field does no work on a charged particle, because it’s always normal to the particle trajectory. Work equals the change in kinetic energy… i.e. no change in speed. A particle is moving in a straight path when a magnetic field is turned on, exerting a force vxB=F according to the right-hand rule.

Why can magnetic forces not do work?

Since the magnetic force is perpendicular to the velocity, as I said above, the value of the dot product is zero so that force does no work.

Why do magnetic fields do not work?

Because the magnetic force is always perpendicular to the motion, the magnetic field can do no work on an isolated charge. It can only do work indirectly, via the electric field generated by a changing magnetic field.

Why don’t we feel the gravitational force from our cell phones?

You will never feel the force of gravity pushing on your body in the same way that a contact force would. Therefore, the gravitational force is negligible as compared to gravity of Earth, that’s why we do not feel the gravitational force between us and a person sitting closely.

What is the work done by the magnetic force on a charged particle moving perpendicular to the magnetic field?

No work is done by the magnetic field on the moving charge.