why the voltage increases less rapidly as the dc current increases in ac generator?
Every magnetic material that a generator is made out of has what's called a saturation point. This is the point at which the material stops behaving like a concentrator of a magnetic field and starts to act like free space. As the DC current in the field winding goes from zero, the material has a linear response to an increase in current, creating a magnetic field that increases in proportion to the current through the windings. But at some point, as the magnetic flux increases more and more, and all the microscopic magnetic domains within the material are alligned with each other, the amount of magnetic flux increase per increase in current starts to drop off. The material becomes saturated. And more current produces minimal gains.
No do not change. I had the comparable undertaking as quickly as I have been given my ceramic braces on good and metallic on backside (5 months in the past). My good lip became into all sticky-outty and the backside wasn't although this is okay now! My tooth moved returned somewhat and now my lips flow appropriate over them and that i will communicate appropriate. basically provide it time ) good success!
Well, I'm not sure why you would want to have both kinds, but that's your choice. Personally, I have the ceramic ones and i love them. They are less bulky and don't stand out as much as the metal braces. They are wonderful for people who are in theatre and choir and such and don't want the braces constantly showing. If you really must get the metal ones i would suggest that you get them on the top and bottom, purely so they match. I don't think it would look good to have both kinds.
