Field Lines in Inductors
Name: Pavel H.
magnetic field in cylindrical induction coil. Field is strongest in
centre and in axis and half in the ends of coil. But I cannot imagine
myself how look like magnetic field inside and outside of induction coil
which is winded around sphere from pole to pole (a little similar as
parallels on globe). How look like intensity and lines of force in
different places (mainly inside)?
First, realize that magnetic field lines are a tool to help you think about
magnetic field. They are not lines of force. Magnetic field does not push
in the direction of field lines. Magnetic field pushes a moving charged
particle perpendicular to the field lines, usually around the field lines.
When you imagine electric field lines, the closer together the field lines,
the stronger the magnetic field. Within a cylindrical induction coil, the
field lines run parallel to each other, from one end to the other. The
lines do not get closer together or further apart. The strength of the
magnetic field is fairly constant through the coil.
As for a spherical coil, the number of lines remains constant through the
coil. Near the ends, the field lines are highly concentrated. Near the
center, they are spread apart. The strength of the magnetic field will be
stronger near the ends and weaker at the center.
Dr. Ken Mellendorf
Illinois Central College
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Update: June 2012