Flux (Continuation)

 Like the last post, in this one we still discussing flux.

  In this photo, students were analysing the lines between three charges and within close, chosen, 'surfaces'. The surfaces that have the point charges within their boundaries will some charge that will go from one point charge to another. It means that they have 'electrons circulating even at the border. Those surfaces are S1, S2, and S3. The Surface S4 has zero flux, because no charge is inside of its boundaries; even though it has a line that passes through, it does not count as as electrical circulation.

In this picture, we had to find a explanation from flux and a mathematical expression that could describe the flux inside of a surface area in a given volume. And since the volume can have any shape, we perform that calculation using integrals. 

This two pictures are describing what happens when a compact disc is putting inside of a micro-have. Lets use water as an example. To heat water, microwave have to 'shoot' electrons that will 'excited' the molecules of water. As the molecules starting get more excited, they will start to gain heat. At a certain point, the molecules will starting to separate from each other, and the water will start to boil. However, with objects like a compact disc, the response is quite different. Until one point it will receive the charges that the microwave will send to heat the disc. But after being saturate with charges, it will re-send it back, or reject, because it cannot expand. At this point the only solution will be 'exploding' to release the excess of electrical charge. The last picture shows what happens when the disc had reached its 'saturation' point. The link bellow shows what we describe it what happens when a compact disc is getting harm on a microwave. 

 What happens with the disc