How can you tell if a piece of metal is magnetic?
Ones Metal and Ones a magnet :D
when the electricity flows into the coils of an electromagnet, it forces a piece of metal that is also magnetic to move in alignment to the magnetic field created by the electromagnet. At this point, the piece of metal stops moving because it is aligned. So, by switching the flow of electrons into the electromagnet, the piece of metal would continue along its path, if the switch of the electron flow is timed correctly.
If the piece of metal is a magnet it will attract another piece of iron. You should be able to feel this attraction as the two become very close. It's magnetic field can be "seen"( that is the effect) by placing iron filings on a piece of glass and place the magnet beneath the glass. Otherwise it is not a magnet.
magnetic domain is region in which the magnetic fields of atoms are grouped together and aligned. In the experiment below, the magnetic domains are indicated by the arrows in the metal material. You can think of magnetic domains as miniature magnets within a material. In an unmagnetized object, like the initial piece of metal in our experiment, all the magnetic domains are pointing in different directions. But, when the metal became magnetized, which is what…
An electric magnet (or as it is more usually called, an electromagnet) requires a core, composed of a piece of iron or any other ferro-magnetic metal, and a wire wrapped around the core, normally in many windings (for greater magnetic strength) all going in the same direction (e.g., clockwise). When a current flows through the wire, the metal core will produce a magnetic field.