Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.
An electric charge is ideally an electron. A magnetic field is what is created when the charge is 'moved'. If you need to know the charge of a magnetic field, you need derive from B-Field to charges/sec. In our world this is typically done via a conductor (typically metal but it can be a gas too).
Basically region around a magnet or a current carrying conductor is said to be magnetic field.
ulltimately whatever is causing magnetic field is nothing but charge again.
Its known that region around a charge is electric field , so the big question is how is magnetic field different from electric field?
How does it originate?
Why doesnt magnetic field effect a charge at rest?
Although not easy to understand Maxwell equations (gauss law) define the relation between electric field and electric charges. They also define that there is no such a thing as a magnetic charge.
That is: an electric charge exists but a magnetic charge does not exist. There is a magnetic dipole but it is not the equivalent of a charge for the magnetic field.
Other maxwell equations (ampere law) describe the static magnetic field produced by a moving charge. Current implies charges in movement so it generates magnetic field.
Maxwell correction to ampere law describes that a changing electric field generates a magnetic field thus predicting the existence of electromagnetic waves. An accelerated charge generates an electromagnetic wave.
Still another maxwell equation (faraday law) describes that a current is generated by a varying magnetic field. Generators/alternators works thanks to this.