Force between magnets Specifying the force between two small magnets is quite complicated because it depends on the strength and orientation of both magnets and their distance and direction relative to each other. The force on each magnet depends on its magnetic moment and the magnetic field of the other.

If freely suspended, one pole will point toward the north. The two poles are thus named the north magnetic pole and the south magnetic pole (or more properly, north-seeking and south-seeking poles, for the attractions in those directions).

The opposite end is called the south pole. However, in Experiment 3, when you move the south pole of a magnet toward the south pole of another magnet, the two magnets repel each other and you cannot move them together. The rule for magnetic poles is that like poles repel each other and unlike poles attract each other.

Figure 20.11 Magnetic field lines can be drawn by moving a small compass from point to point around a magnet. At each point, draw a short line in the direction of the compass needle. When opposite poles of two magnets are brought together, the magnetic field lines join together and become denser between the poles.

Magnetic PE depends on both distance and orientation in the magnetic field. A south pole of one magnet can approach the north pole of another. This makes an attractive force between the two magnets. The farther apart they are, the higher their potential energy.

Magnets always come with a pair of poles, north and south together called a magnetic dipole. The force between two pairs of poles falls off proportional to the inverse fourth power of the distance between them. (The like poles repel and the unlike poles attract.

Chapter 2: Why does the train rise without anything touching it? Students figure out: When the train starts moving as it rises off the track, it does so because of a non-touching force: magnetic force. The train rises because a repelling force acts between magnets on the tracks and magnets on the train.

List of Magnetic Metals

• Iron. Iron is an extremely well-known ferromagnetic metal.
• Nickel. Nickel is another popular magnetic metal with ferromagnetic properties.
• Cobalt. Cobalt is an important ferromagnetic metal.
• Steel.
• Stainless Steel.
• Rare Earth Metals.
• Aluminium.
• Gold.

Gold is NOT attracted to a magnet. One way of telling if your jewelry is actually gold is by using a magnet. If your gold is magnetic, then there is iron or nickel inside of it.

Gently drop your item into the water. If it sinks, it’s likely real gold. Real gold will sink to the bottom because it’s denser than water. Gold will also not rust, so if you see any signs of rust you know your piece isn’t real gold, and there’s no worry about damaging your item if it is indeed real gold.

There are three methods of diamond searching. Surface searching consists of walking up and down the rows of dirt looking for diamonds lying on top of the ground. This is the most productive method following a hard rain. Rain washes the soil away, leaving diamonds and other rocks and minerals exposed on the surface.