Magnetic Field Line Reach
Name: Leo H.
How far reaching are magnetic fields on magnets.
If for example, we could show all existing field lines of a 1/2
inch x 1/2 bar magnet, how far could the weakest line travel from
the pole before returning back? Is it limitless as the equations
propose ? And as I move the magnet, does the field move at the
same time? Does the field deform as I move the magnet? Are the
field lines actual channels by which electrons travel?
The field from a bar magnet goes to zero at infinity. (It decreases as
the third power of the distance from the center of the magnet.)
As the magnet moves, the field moves with it, but there is a time lag
imposed by the finite speed of light.
Field lines are not channels by which electrons travel.
Click here to return to the Physics Archives
Update: June 2012