Question

why does a moving charge experiences a force when placed in a magnetic field

Answer 1

Magnetic forces on moving charges. One basic feature of magnetism is that, in the vicinity of a magnetic field, a moving charge will experience a force. ... Thus magnetic forces cause charged particles to change their direction of motion, but they do not change the speed of the particle.

Answer 2

In the presence of a magnetic field, a moving charge will always experience a force.

• F = qvB ,  If v is zero, then force is also zero.  This force on the object being charged is always perpendicular to the direction it is traveling. While magnetic forces cause charged particles to shift their direction of motion, but do not change the particle's velocity.

• When a charged particle moves relative to a magnetic field, it will encounter force unless it travels parallel to the ground. The charging symbol, the direction of the magnetic field and the direction that the particle moves will all influence the direction of the force that the particle encounters.