# GEOLOGY

## EARTH SCIENCE

### MAGNETISM

 Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A magnetic field is a field of force that is produced by moving ____ charges.
 A northern B positive C gravitational D electric
Explanation:

Detailed explanation-1: -A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. A moving charge in a magnetic field experiences a force perpendicular to its own velocity and to the magnetic field.

Detailed explanation-2: -When a charged particle-such as an electron, proton or ion-is in motion, magnetic lines of force rotate around the particle. Since electrical currentmoving through a wire consists of electrons in motion, there is amagnetic field around the wire.

Detailed explanation-3: -However, a magnetic effect is caused by moving electric charges while an electric field is caused by stationary charges. For example, the magnetic field seen in a simple steel bar magnet is the result of the orbiting and spinning charges of subatomic particle.

Detailed explanation-4: -A magnetic field describes a volume of space where there is a change in energy. As Ampere suggested, a magnetic field is produced whenever an electrical charge is in motion. The spinning and orbiting of the nucleus of an atom produces a magnetic field as does electrical current flowing through a wire.

Detailed explanation-5: -What is the force on a moving charge in a magnetic field? The Lorentz force is the net force on a charge as it travels through an electric and magnetic field. It is essentially the sum of magnetic and electric forces.

There is 1 question to complete.