Show the difference between the two methods of making artificial magnets
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In your experiment, the soft iron becomes a temporary magnet only while it is in contact with the permanent magnet. When the permanent magnet is removed, the soft iron loses its magnetization.
Think of it like stretching a spring then letting it collapse back to zero. If you stretch the spring far enough though, you can permanently deform it.
The soft iron can become permanently magnetized by a number of methods.
1. Apply a HUGE magnetic field to the iron. If the force was large enough, it permanently magnetizes the iron. This is the method usually used to manufacture magnets.
2. Apply a smaller magnetic field the iron and at the same time, whack it a good one with a hammer. This shakes up the iron and it to magnetize a little,
3. Apply a magnetic field and at the same time heat the iron to its Currie temperature (very hot, but not melting) and allow it to cool again. The iron becomes magnetized to the almost exact amount of the magnetizing field.
Think of it like stretching a spring then letting it collapse back to zero. If you stretch the spring far enough though, you can permanently deform it.
The soft iron can become permanently magnetized by a number of methods.
1. Apply a HUGE magnetic field to the iron. If the force was large enough, it permanently magnetizes the iron. This is the method usually used to manufacture magnets.
2. Apply a smaller magnetic field the iron and at the same time, whack it a good one with a hammer. This shakes up the iron and it to magnetize a little,
3. Apply a magnetic field and at the same time heat the iron to its Currie temperature (very hot, but not melting) and allow it to cool again. The iron becomes magnetized to the almost exact amount of the magnetizing field.
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