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# Magnetic Field

We hold a magnet with a powder steel with cast iron powder, copper, messing, bronze, nickel, plastic, wood and paper separately. Magnet will attract iron filings, cast iron, nickel, cobalt and hold it (still attached), is shown in Figure 6.1.

Figure 6.1 Magnet pull rod iron powder
Steel, tuanng iron, nickel and cobalt are ferromagnetic materials such as iron.

Pole Magnet
We touch on an iron rod and a magnet is shifted from one end of our country to the other, as shown in Figure 6.2. As a result, when attached to the ends of the magnetic rods, feels the pull of strong than in the middle of the bar magnet.

Figure 6.2 Experimental identification of magnetic poles

In the section that has great appeal of a bar magnet is called the pole (pole). The magnetic force at the end of the bar magnet and getting into the center of the magnetic forces become weaker. Being in the middle of the bar magnets there is no magnetic force. A bar magnet is hung such that the magnetic rod terbut can rotate with the swivel point at the middle of the bar magnet (Figure 6.3). It turned out that the magnetic rod will stop at the position of the wind north – south. Pole bar magnet that points towards the north is called the north pole (U) and the other is called the south pole (S).

Figure 6.3 The basic principle of the compass

In use, the magnetic needle is used to make a pointing device called a compass direction.
Bar magnet is placed on two rollers, then we hold the other bar magnet between the end (Figure 1.102). Turns magnet rods with roller interested came forward as the tip adjacent namesake not. If the magnet is reversed so that the poles adjacent namesake, the magnet that is above the roller away.

Figure 6.4 The attraction and repulsion between the magnetic poles

Take two bar magnets and the edges together, then do an experiment like Figure 6.4.

Figure 6.5 The two magnet united

The sides of which one has a stronger magnet? It turns out the side that has strong magnetic power only at its edges, so that the two magnets becomes like a magnet. This incident also occurred on the contrary, if a bar magnet we cut into pieces, then each piece will have the poles of a magnet as a whole (Figure 1104).

Figure 6.6 Magnet stems cut

Magnetic materials composed of magnetic molecules such as the composition above. If the material is not dimagnetkan the molecules within the material a random direction (Figure 1105). Figure 6.7 Molecules in magnetic materials.

Figure 6.7 Molecules in magnetic materials