Where are the poles of a ring magnet?

Where are the poles for a ring shaped magnet?

Why water doesn't spills out when ice cubes are dropped inside a beaker full of water?

In a ring shaped magnet, one face is the north pole, while the other face is the south pole.

As for the ice cube... I never heard of that, and I know that ice cubes once made a glass full of water overflow...

EDIT: That just didn't make sense... lol

What I meant was I once put ice cubes in a glass full of water, and the water overflowed.

Agree with Unk on the magnet queston.

As for ice cubes - good old Archimedes is at play here. The question is usually posed like this:

I put ice cubes into a glass, then fill the glass with water to the rim. Ice being less dense than water - the top of the ice cubes actually stick up above the rim of the glass. So as the ice melts and turns to water why doesn't the glass overflow?

The answer has to do with the fact that the volume of water displaced by the ice cube (the volume of the ice cube at the water line and below) is equal in weight to the ice cube. When the ice cube melts, its resulting volume as water is equal to the volume of water it originally displaced when it was ice. Stated another way - because water is denser than ice, the volume of the melted ice cube water is smaller than the original ice cube.

Hope this gets at what you're asking.

May be its because as the cube of the ice is dropped it absorbs water