Magnet Queries...?

Question

If i make a magnet say which is 1 meter long and has a square cross section of 1 sq.cm. It will of course have north-south.

1. If we bend this magnet such that it becomes a circle (like a ring) how will this behave?

2. if we have two such ring magnet, will they repel or attract each other when placed side by side?

3. will these two ring magnets repel or attract when place one above another?

4. can we have a magnet in the form of a sphere?

Answer 1

I am assuming that you are talking about a bar magnet with the spin directions fixed parallel to the long axis of the underlying material, and they stay this way when you bend it, so that the spins follow the circumference.

Your magnet will still be magnetic, the field lines still fringe out of the material. Such ring magnets still have an orientation: clockwise-counterclockwise pairs will attract, clockwise-clockwise pairs will repel.

Yes, a magnet can be spherical--just carve a sphere out of a big block of magnet.