Recent content by Anthony physics

Ive asked this question before but i wrote it in a very confusing manner so ill do it again but in more qualitative terms: The "classical railgun" i first learned about (mag field is produced by a permanent magnet) has a top speed because as the slug accelerates, the time derivative of mag flux...

I guess i missworded. The point was, there would never be a point when the current or the field would be zero because as they get smaller and smaller, the back voltage produced by faraday would also get smaller and smaller

Ive recently been thinking of rail guns. When i first learned about this type of motor ( we use to call it the linear motor), i read that the projectile would eventually reach a top speed because of faraday's law creating a counter current. However, what if the magnetic field ( the one that is...

Ok, I've spent lots of hours browsing the web and the library and still this question is burning. How can i calculate, whether it be experimentally or theoretically, the " pole strength" of a magnet. (I have read about the experiment where you divide the work it takes to turn a magnet around a...

This seems simple but i cannot find an answer anywhere. First off: is iron attracted to a magnet because the field strength on the side of the iron object closest to the magnet is stronger than the one furthest? And if this is true, how can one use this "differential" magnetic field to calculate...