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184_notes:conservation_theorems [2018/08/09 19:38] – [Effects and Applications] curdemma | 184_notes:conservation_theorems [2021/07/06 17:36] – bartonmo | ||
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Chapters 18 and 19 (and Chapters 2, 3, 6, 11, and 13) in Matter and Interactions (4th edition) | Chapters 18 and 19 (and Chapters 2, 3, 6, 11, and 13) in Matter and Interactions (4th edition) | ||
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===== Conservation Theorems ===== | ===== Conservation Theorems ===== | ||
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{{youtube> | {{youtube> | ||
- | ==== Linear and Angular Momentum Conservation in E&M ==== | + | ===== Linear and Angular Momentum Conservation in E& |
We have not talked much about linear and angular momentum conservation in an electromagnetic system because they extend beyond the scope of this course. This is because to truly understand the relationship between these and the electromagnetic field, we must develop an understanding that the electromagnetic field can have linear and angular momentum. That's right, the field itself has momentum that can push physical objects or twist them. This might seem very strange, but it is definitely the case that the electromagnetic field itself can have both. | We have not talked much about linear and angular momentum conservation in an electromagnetic system because they extend beyond the scope of this course. This is because to truly understand the relationship between these and the electromagnetic field, we must develop an understanding that the electromagnetic field can have linear and angular momentum. That's right, the field itself has momentum that can push physical objects or twist them. This might seem very strange, but it is definitely the case that the electromagnetic field itself can have both. | ||
- | A common example of this comes from astrophysics. When a star is going through fusion, it has a lot of gas pushing outward from the core. In addition, light is carried outward. This is complicated process, but the gas and light run into material in front of them as they move towards the stellar surface. These pushes by the gas and light cause a pressure on the material in front of them; pushing them outward. However, the gas in front of the outward moving gas and light is gravitationally attracted to any matter behind it. This careful balance of the gravitational pressure, gas pressure, and radiation pressure (the momentum imparted by collisions of electromagnetic radiation with material) determines the size, temperature, | + | A common example of this comes from astrophysics. When a star is going through fusion, it has a lot of gas pushing outward from the core. In addition, light is carried outward. This is a complicated process, but the gas and light run into the material in front of them as they move towards the stellar surface. These pushes by the gas and light causes |
==== Energy and Charge Conservation in E&M ==== | ==== Energy and Charge Conservation in E&M ==== |