Magnetic Fields !!!
It's all around you and you don't even know !!
A Magnetic Field is a mathematical description of the magnetic influence of electric currents and magnetic materials. The magnetic field at any given point is specified by both a direction and a magnitude; as such it is a vector field. (http://en.wikipedia.org/wiki/Magnetic_field)
Magnetic field lines
- Magnetic Field Lines show magnitude and direction of the Magnetic Field when the lines of the magnetic field are close together the magnetic field
Magnetic Field of Current
The magnetic field lines around a long wire which carries an electric current form concentric circles around the wire. The direction of the magnetic field is perpendicular to the wire and is in the direction the fingers of your right hand would curl if you wrapped them around the wire with your thumb in the direction of the current. (http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/magcur.html)
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Physical Science 6.7a - Magnetic Fields