Magnetic interaction with moving charge
A moving charge produces magnetic field which will be effected by the external magnetic field. Hence the charge would deviate from its original direction.
The magnetic effect of electric current has many applications. For example, electric motors, transformers, telephone receivers, microphones, loudspeakers, measuring instruments like galvanometer, voltmeter, ammeter etc., are based on this effect. Thanks to the discoveries of Faraday, Lenz, Tesla and others, we are able to use their principles for generating electricity, run electric motors and in general enjoy all the advances of modern science and technology.
We will now see how all the laws and principles discussed in Electromagnetism are made use of in a few important electrical machines and devices. The interaction of a moving charge (or current) with a constant magnetic field can be visualized as follows:
When a charge q moves at a velocity v through an electric field E and a magnetic field B, total Lorentz force is given as