Hence magnetic forces do no work on charged particles and cannot increase their kinetic energy. If a charged particle moves through a constant magnetic field, its speed stays the same, but its direction is constantly changing.

Figure 11.4. 2: A charged particle moving with a velocity not in the same direction as the magnetic field. 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 force, experienced by the charge particle is perpendicular to the instantaneous velocity, V at all instants. Hence, the magnetic force cannot bring any charge in the speed of the charged particle. Since the velocity remains constant, the kinetic energy also remains constant.

magnetic field

The magnetic force on a free moving charge is perpendicular to both the velocity of the charge and the magnetic field with direction given by the right hand rule. The force is given by the charge times the vector product of velocity and magnetic field.

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

No work is done by the magnetic field on the charge. B. Magnetic fields can also be produced by a moving charge whose intensity can be determined by the velocity and magnitude of charge.

Because the magnetic force on a moving charge is perpendicular to the velocity, the work done by a magnetic force is zero.

The direction of the magnetic force on a moving charge is perpendicular to the plane formed by v and B and follows right hand rule–1 (RHR-1) as shown. The magnitude of the force is proportional to q, v, B, and the sine of the angle between v and B.

Magnetic fields exert forces on charged particles in motion. The direction of the magnetic force F is perpendicular to the plane formed by v and B as determined by the right hand rule.

All magnets have north and south poles. Opposite poles are attracted to each other, while the same poles repel each other. When you rub a piece of iron along a magnet, the north-seeking poles of the atoms in the iron line up in the same direction. The force generated by the aligned atoms creates a magnetic field.

All magnets have two ends, which are commonly referred to as north and south poles. The determining factor of whether a magnet attracts or repels is the pole. Magnets attract when a north pole is introduced to a south pole. If like poles are introduced, either north to north or south to south, the magnets repel.

Magnetic forces are non contact forces; they pull or push on objects without touching them. Magnets are only attracted to a few ‘magnetic’ metals and not all matter. Magnets are attracted to and repel other magnets.

Magnets are only attracted to special metals. Iron, cobalt and nickel are magnetic. Metals that have iron in them attract magnets well. Steel is one.

iron