Rotating Magnetic Field's and Inductors.

[TinselKoala]

Would anyone care to guess what kind of magnet I used here?
Can anyone make a magnet like this?

Since your trace has not started from, nor returned to, the channel's zero volt baseline, it seems that you aren't showing the entire pulse shape on your screenshot. So how are we to "guess" anything from this partial information?

[tinman]

Would anyone care to guess what kind of magnet I used here?
Can anyone make a magnet like this?

That wave form can be achieved in many ways Luc-->see first scope shot below.

But can you arrange your magnetic field so as only an alternating DC voltage is produced by the coil without the use of rectifiers?-see second scope shot.

Brad

[TinselKoala]

That is dependent on magnet orientation--see next post.

Many things "depend on magnet orientation". I have been discussing and illustrating the simplest case, as I described and made explicit in my explanations. If you want to move the goalposts, that's your privilege I suppose,  but it isn't helping people to understand Faraday's Law of Induction.

You can argue all you like, change the problem around to make it a different one, but what I've said in my descriptions is correct, and anyone can repeat the experiment at home and get the same results.

Webby got it right: the trace was made by a "donut" shaped magnet, polarized on the faces, with a hole in the center. He understands Faraday's Law and how the induced EMF in the coil changes in response to what part of the magnet is doing what.
What was your guess?

[TinselKoala]

That wave form can be achieved in many ways Luc-->see first scope shot below.

But can you arrange your magnetic field so as only an alternating DC voltage is produced by the coil without the use of rectifiers?-see second scope shot.

Brad

That can be done by biasing the coil with a little DC voltage before moving the magnet past it.

[tinman]

You can argue all you like, change the problem around to make it a different one, but what I've said in my descriptions is correct, and anyone can repeat the experiment at home and get the same results.

Webby got it right: the trace was made by a "donut" shaped magnet, polarized on the faces, with a hole in the center. He understands Faraday's Law and how the induced EMF in the coil changes in response to what part of the magnet is doing what.

What was your guess?

My guess was the same,although i was just going to use the words speaker magnet--same thing.

Many things "depend on magnet orientation". I have been discussing and illustrating the simplest case, as I described and made explicit in my explanations. If you want to move the goalposts, that's your privilege I suppose,  but it isn't helping people to understand Faraday's Law of Induction.

I dont dispute what you are saying TK,and as you posted some different wave forms produced by magnet's,and was asking what kind of magnet was being used--as did Luc--i thought we were having some sort of !guess the magnetic field used! kind of game.

So can you produce an alternating DC voltage across a coil without the use of diode's,but only PM's orientated in a certain way?. The wave form is not important,as long as the voltage across the coil always remains above 0 volts.

Brad