# Magnetic Fields

## What is a Magnetic Field?

It is a magnet that produces a vector field, the magnetic field, at all points in the space around it. It can be defined by measuring the force the field exerts on a moving charged particle, such as an electron. The force (F) is equal to the charge (q) times the speed of the particle times the magnitude of the field (B), or F = q*v x B, where the direction of F is at right angles to both v and B as a result of the cross product. It will define the magnetic field's strength and direction at any point.

## Definition

It's a magnetized region of space: a region of space surrounding a magnetized body or current-carrying circuit in which the resulting magnetic force that can be detected.

## What creates a Magnetic Field?

A magnetic field can be created with moving charges, such as a current-carrying wire. A magnetic field can also be created by the spin magnetic dipole moment, and by the orbital magnetic dipole moment of an electron within an atom. Still not enough? Watch this video to have a better understanding about Magnetic Fields.
physics animations - The Magnetic Field

## What is the relationship between the Right Hand Rule and the Magnetic Field?

When current flows in a wire, a magnetic field is created around the wire. To actually see this, take your right hand, curl the fingers, and stick the thumb straight out. Now, point your thumb in the direction of the current flowing in the wire (using conventional current where current flows from the + end of a battery to the - end of the battery. NOTE: electrons flow from the - end of a battery to the + end, and is called electron current instead of conventional current). The direction your fingers are curved around the wire is the direction of the magnetic field around the wire.

## Who discovered the Magnetic Field?

The first person to discover information about Magnetics Fields would be Nikola Tesla. It was in 1887, that Tesla constructed a brushless alternating current induction motor, based on a rotating magnetic field principle he claimed to have conceived of in 1882.