Question

How is a magnetic field generated?

Answer 1

A magnetic field is generated whenever a charge is in motion. This can be caused by the spin and orbit around an atomic nucleus or an electrical current through a wire.

Answer 2

Magnetic fields are generated by charges in motion

Step-by-step explanation:

Magnetic fields are produced by charges in motion. However, charges in motion are currents, therefore we can also say that magnetic fields are generated by currents.

We can use as example the magnetic field produced by a current-carrying wire. The magnitude of the magnetic field produced by a current-carrying wire is given by:

`B=(\mu_0 I)/(2 \pi r)`

where
`\mu_0` is the vacuum permeability, I is the current intensity, and r is the radial distance from the wire. The lines of the magnetic field correspond to concentric circles around the wire.

Magnetic fields are also produced by magnets, which are material that generate magnetic fields. A magnet always consists of a north pole and a south pole, and the lines of the magnetic field go from the north pole to the south pole.