Can magnet be sphere shape?

Question

Can magnet work in sphere shape?

Answer 1

Characteristics of magnets

Permanent magnets and dipoles
All magnets have at least two poles: that is, all magnets have at least one north pole and at least one south pole. The poles are not a pair of things on or inside the magnet. They are a concept used to discuss and describe magnets. In the image at the top of this page, the poles look like specific locations, because the highest surface intensity of the field occurs at the poles, but this does not mean that they are specific locations.

To understand the concept of pole, it can be imagined that a row of people who are all facing the same direction and standing in line. While there is a "face" end of the line and a "back" end of the line, there is no one place where all of the faces are and all of the backs are. The person at the front of the face end has a back; and the person at the back end has a face. If the line is divided into two shorter lines, each one of the shorter lines still has a face end and a back end. Even if the line is pulled completely apart so that there are just individuals standing around, each one of the individuals still has a face and a back. This can continue without end.

The same holds true with magnets. There is not one place where all of the north or south poles are. If a magnet is divided in two, two magnets will result and both magnets will have a north and a south pole. Those smaller magnets can then be divided, and all of the resulting pieces will have both a north and south pole. In most instances, if the material continues to be broken into smaller and smaller pieces there will be a point where the pieces are too small to retain a net magnetic field. They won't become individual north or south poles though; instead, they will just lose the ability to maintain a net field. Some materials, however, can be divided down to the molecular level and still maintain a net field with both a north and a south pole. There are theories involving the possibility of north and south magnetic monopoles, but no magnetic monopole has ever been found.

North-south pole designation and the Earth's magnetic field
A standard naming system for the poles of magnets is important. Historically, the terms north and south reflect awareness of the relationship between magnets and the earth's magnetic field. A freely suspended magnet will eventually orient itself north-to-south, because of its attraction to the north and south magnetic poles of the earth. The end of a magnet that points toward the Earth's geographic North Pole is labeled as the north pole of the magnet; correspondingly, the end that points south is the south pole of the magnet.

The Earth's current geographic north is thus actually its magnetic south. Confounding the situation further, magnetised rocks on the ocean floor show that the Earth's magnetic field has reversed itself in the past, so this system of naming is likely to be backward at some time in the future.

Fortunately, by using an electromagnet and the right hand rule, the orientation of the field of a magnet can be defined without reference to the Earth's geomagnetic field.

To avoid the confusion between geographic and magnetic north and south poles, the terms positive and negative are sometimes used for the poles of a magnet. The positive pole is that which seeks geographical north.

Answer 2

I assume you mean can a magnetic field have spherical symmetry, with field lines diverging from a center point. Theoretically the answer is yes. It would be called a magnetic monopole and would have to contain particles called, well, magnetic monopoles. No such particles have ever been observed, though, despite searches. All known magnetic fields come with a conventional dipole (with a north and south) or higher order multipole structure.

Answer 3

No. All magnets should have two poles. And by the way, the Earth is not a magnet. If it was, then a piece of magnet placed on earth should repel.

Answer 4

No. Magnetism is produce by the spin in the electron . It always aligned along the the direction of its poles and therefore the field lines are always N-S.

Answer 5

the earth is one giant magnet
...so yes

Answer 6

Yes, that is what the earth and it's core make, a revolving gyromagnet.