a coil wrapped all the way around a soft iron torus, as it has no end points, where would the poles be?
2006-09-06 21:17:21 · 10 answers · asked by Andy G 2 in Science & Mathematics ➔ Physics
In the case of a torus with a coil wrapped around it, the magnetic fields circle inside the torus along the interior of the wire coil, and do not touch the surface of the torus. Therefore in this respect, there are NO poles.
BTW, this is how hot plasma is confined within a circular ring (a torus-shaped ring) via magnetic fields. Take a look at the following link (see The Tokamak):
http://library.thinkquest.org/17940/texts/magnetic_confinement/magnetic_confinement.html
2006-09-06 22:07:03 · answer #1 · answered by PhysicsDude 7 · 1⤊ 0⤋
The iron core of a solenoid is non-magnetic with no current flowing through the coil.. A solenoid valve, for example, is used when the cut off of flow is required. Take an automatic washing machine. Electrical energy is used to energise the solenoid and open the water intake valve. When the the water reaches the designated level, an automatic switch shuts off the power to the solenoid and closes the valve. The washer goes into its next step in the timer sequence. If the solenoid remained magnetic the valve wouldn't close.
2016-03-27 01:13:43 · answer #2 · answered by Anonymous · 0⤊ 0⤋
poles lie in a line that passes perpendicular through the area encosed by the torus.
2006-09-06 21:38:54 · answer #3 · answered by i_Abhishek 2 · 0⤊ 0⤋
if you insert a pen in the hole of the torus, the ends of the pen are where the poles are directed.
use the right hand rule to determine where the north pole is.
2006-09-06 21:24:42 · answer #4 · answered by lnfrared Loaf 6 · 0⤊ 0⤋
The magnetic field is always a closed one; At the begining to undetrstand about the field the pole concepts are used. Once it is understood that the mag field is a closed one ,the concept of pole is not neccessary.
In your example there are no poles.
2006-09-06 21:40:00 · answer #5 · answered by Pearlsawme 7 · 1⤊ 0⤋
If I understand your question correctly, there would be no external poles. The lines of flux would stay within the core.
As an analogy, a circle has no end points, although it can appear to have them if part of it is hidden.
2006-09-06 21:57:01 · answer #6 · answered by or_try_this 3 · 0⤊ 0⤋
excellent ques .you can apply the end rule to find the position of poles.when you kook from a particular direction if the direction of current is clockwise then the nearer end is south pole and farther end is north pole and vice-versa.
2006-09-07 00:41:16 · answer #7 · answered by siram v 1 · 0⤊ 0⤋
I have never seen such solenoid before.Because magnetic field has no chance to escape in toroid core.
Since you cannot use the magnetic field in the core there is no solenoid action.
Toroid cores are usually used for choke(inductor) and transformer.
Visit
http://en.wikipedia.org/wiki/Solenoid
for more detail of solenoid.
2006-09-07 04:05:22 · answer #8 · answered by dwarf 3 · 0⤊ 0⤋
I would assume on the two faces (and not on an edge as you seem to be looking for)
2006-09-06 21:23:00 · answer #9 · answered by Neil 5 · 0⤊ 0⤋
i think they would cancel each other.
2006-09-06 21:24:45 · answer #10 · answered by rob a 1 · 0⤊ 1⤋