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Name: Pavel H.
Status: other
Age: 50s
Location: N/A
Country: N/A
Date: 2/26/2003


Question:
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)?


Replies:
Pavel,

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
Physics Instructor
Illinois Central College



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