Standard 

• magnetic field - a region around a magnetic material or a moving electric charge within which the force of magnetism acts.
• Electro magnetic -  of or relating to the interrelation of electric currents or fields and magnetic fields
• Magnet - a piece of iron (or an ore, alloy, or other material) that has its component atoms so ordered that the material exhibits properties of magnetism, such as attracting other iron-containing objects or aligning itself in an external magnetic field.
• iron  filings - Iron filings are very small pieces of iron that look like a light powder. They are very often used in science demonstrations to show the direction of a magnetic field. Since iron is a ferromagnetic material, a magnetic field induces each particle to become a tiny bar magnet.
• electrical currents - An electric current is a flow of electric charge. In electric circuits this charge is often carried by moving electrons in a wire. It can also be carried by ions in an electrolyte, or by both ions and electrons such as in a plasma.

1. what are magnetic fields ?
2. what are the different types of magnets ?
3. what is are iron filings ?