How moving charges produce Magnetic Field? What is the physics behind that?
There is nothing you can put in your gas tank that will fix an EGR valve. EGR (Exhaust Gas Recirculation) valves mount between the exhaust and intake systems, so any additives you put into your fuel will be burned off prior to getting to the valve.
I'm of the same mind as Harihara, but in my own words, it's just the way it is. It's nature, and this is how nature works. We don't know the physics behind it. There are many laws of physics that just are. We can write laws and equations to describe what happens. But why or how, we don't know. My guess is that once we get GUT (Grand Unified Theory) down pat, we'll be closer to understanding how and why the universe works the way it does. But right now we'll just have to accept certain givens. Like, gravity exists. Like, light moves at a constant speed if measured by any observer in a non-accelerating frame of reference. Like, a magnetic field is produced by a moving charge. Like, an electromagnetic field is produced by an accelerating charge. All these are natural phenomena. How or why they happen, we don't know.
On some cars it is possible to clean the valve, on some they are a sealed unit, like the MK6 Golf tdi, CAY Engine. These are a pig to get at, VW estimated 7 hours labour, and ?350 +VAT for the valve. The hourly rate I am told is ?70 +VAT. so you can see how expensive it is. It is a common fault on VW Golf MK6 they gum up at 60K miles or 4 years. On my Mk5 Golf I used to take it off every year and clean it.
Well, I guess you already know that changing electric current causes the magnetic field. There is no physics behind this natural phenomenon. It is like you study the electric field and get to know about the magnetic fields' existence along with. I read that Earth is a dynamo therefore the magnetic field exists. But no reasons why an electron flow causes a magnetic field? It is just like, how the planets were formed has been known but not why they should be there first of all? We go from the results to the methods in many cases in science. For example, if only earth supports life and not other planets in the solar system then it should be the distance, the atmosphere and so on.
All magnetic fields result, in one way or another, from moving charges. Although allowed by Maxwell's equations, which mathematically relate electric and magnetic fields via the source charges and currents (moving electric charges), the 'magnetic monopole' has never been observed. If it existed, it would be a particle responsible for the creation of a magnetic field absent an electric current. Electric fields come from charges. So do magnetic fields, but from moving charges, or currents, which are simply a whole bunch of moving charges. In a permanent magnet, the magnetic field comes from the motion of the electrons inside the material, or, more precisely, from something called the electron spin. The electron spin is a bit like the Earth spinning on its axis. Very serious problems arise if the charged rotating ball model of the electron is taken too literally, not the least of which is due to the fact that the electron has no known radius. That is, as far as has ever been observed experimentally, the electron behaves as a true mathematical point, or singularity, without a measurable radius. The magnetic moment, or field, of the electron arises for more subtle reasons based in quantum mechanics and the quantum theory of fields
