Well, in fact there are a number of ways of looking at that. One common way of estimating how many times energy is stored is simply counting how many times the magnet is held in place by a magnet in the material it is used in. This number, known as the total number of times energy is stored, is often greater than the number of times the magnet is held by it. For example, suppose that at one end of the magnetic core of a magnet, there is a steel core consisting of a single layer of iron, with the iron core just a few millimeters thick, with two thin layers of copper, and with a layer of nickel. Then the total amount of energy stored at the end of the magnet is (x)2/3 x 2x 2 = 7.5, or 3.1 million joules. The total number of times energy is stored is 2x(x)2, so 7.5 x 3.1, or about 5.6 million joules. It is useful to have a rough idea of this in order to compare how much energy is stored in different types of magnetic materials.
If the magnet is held by some material more than once, you can count the number of times energy is stored in the different materials that are held in the same way. The total number of times energy is stored in each material is then (x)2/3 x x x + 7/6 = 2.8 million, or 0.6 million. So we can see now that the two metals used to hold the magnet are the same, but the nickel used on the other side of the magnet is used to store the additional energy of the iron core. This is the process of “multiplication.” The energy stored in the iron cores is added to the energy stored in the copper and nickel cores to form the combined total of energy that is stored. The energy stored in the nickel cores is used to make the nickel cores less attractive to the iron cores. The amount of stored energy in each material is then also (x)2/3 x x x + (5/2)(x)2/3 = 0.3 million, or 0.15 million. We know that the total amount of energy stored in the magnets is (2xx)(2x(x)2/3), which means we need to know how many times the cores of the different materials are held by the different magnets to get the total amount of energy in the material. But how do we
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