Difference between revisions of "Induction"
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==Induction== | ==Induction== | ||
| − | + | Before going through the math behind induction, it is best to first look at what is going on at the atomic level. Everything is charged at that level. Electrons and nuclei have charges, they are moving, thus they have magnetic fields. Therefore everything that has matter has magnetic fields. Magnetic fields are (so far as we know) infinitesimal in size so they are affected by all matter. The size of the effect is additive, and since magnetic fields have direction, these sums can be large or small depending on the directions of the fields for each particle. Since magnetic fields interact with each other, everything is interacting with everything else. Actually there are 4 fundamental 'interactions'. These are called gravity, electromagnetism, the strong force and the weak force. These forces work over their own ranges, becoming infinitesimal outside those ranges. | |
At the sizes and distances of atoms and free electrons, the dominant force is electromagnetic. When an external magnetic field moves through matter, the field is affected by the matter and the matter is affected by the field. This is the fundamental cause of induction. Sample A is affected by Sample B via their magnetic fields. A basic example of action at a distance. | At the sizes and distances of atoms and free electrons, the dominant force is electromagnetic. When an external magnetic field moves through matter, the field is affected by the matter and the matter is affected by the field. This is the fundamental cause of induction. Sample A is affected by Sample B via their magnetic fields. A basic example of action at a distance. | ||
Revision as of 02:15, 20 June 2020
Induction
Before going through the math behind induction, it is best to first look at what is going on at the atomic level. Everything is charged at that level. Electrons and nuclei have charges, they are moving, thus they have magnetic fields. Therefore everything that has matter has magnetic fields. Magnetic fields are (so far as we know) infinitesimal in size so they are affected by all matter. The size of the effect is additive, and since magnetic fields have direction, these sums can be large or small depending on the directions of the fields for each particle. Since magnetic fields interact with each other, everything is interacting with everything else. Actually there are 4 fundamental 'interactions'. These are called gravity, electromagnetism, the strong force and the weak force. These forces work over their own ranges, becoming infinitesimal outside those ranges.
At the sizes and distances of atoms and free electrons, the dominant force is electromagnetic. When an external magnetic field moves through matter, the field is affected by the matter and the matter is affected by the field. This is the fundamental cause of induction. Sample A is affected by Sample B via their magnetic fields. A basic example of action at a distance.
For samples with randomized magnetic fields, the sum of all the fields is close to zero, so this sample will have small effects on other samples via magnetic fields since their net magnetic fields are small. For samples with large net magnetic fields, or with potentially large magnetic fields (i.e. the sample can be manipulated in some fashion to generate a field, such as passing current through a wire), there are large effects via magnetic field interactions.
Extrapolating this idea, a current passing through a wire of sample A will generate a magnetic field, which will interact with a wire of sample B that is close by, generating a magnetic field which will cause a current to flow in the wire of sample B. This is induction. The current in sample A induces a current in sample B, and it happens via magnetic fields.
