MH's ideal coil and voltage question

poynt99 · May 10, 2016, 02:27:35 PM

Brad,

I don't understand what verpies is trying to say, so I can't say if he is in agreement with MH or not.

You could ask him.

Magneticitist · May 10, 2016, 02:59:43 PM

hmm, I thought the EMF followed current. It's the electric field that's the precursor. No EMF if the current is not allowed to change. Electric field see's whats going on the entire time tho.

- question:

is a rise in current a change in current, or not?

the inverse exponential curve to straight line makes perfect sense though..
that is, if current were allowed to flow or change. we have to assume that
is the case first.

*unlike a capacitor, imaginarily we have started at source voltage in our scenario across the inductor. well, again, unlike the capacitor, mission accomplished. no need for current flow because no lenz effect.

verpies · May 10, 2016, 05:18:14 PM

Quote from: Magneticitist on May 10, 2016, 02:59:43 PM
is a rise in current a change in current, or not?

It is

allcanadian · May 10, 2016, 05:18:46 PM

Magneticitist

Quotehmm, I thought the EMF followed current. It's the electric field that's the precursor. No EMF if the current is not allowed to change. Electric field see's whats going on the entire time tho.

You may want to rethink your statement. The Electro-Motive Force is the force which causes the charges to move and this motion is called an electric current. The EMF is a Force on the charges and without a force acting on something it has no reason to move.

I cannot even begin to explain how completely messed up your post is... review Coulombs Law, Faradays Law, Electron flow notation, an Electro-Motive Force (Emf).

AC

Magneticitist · May 10, 2016, 05:54:12 PM

I don't understand what you mean. I'm saying EMF is a result of current. Well, 'result of' is not quite what I mean but it's hard for me to word it otherwise.

How can there be an electromagnetic field without current? There is however an electric field, the voltage.

-maybe I have this wrong but I think you may be missing that we are essentially saying the same thing. damn maybe MH is right and I need to start honing my word choices but can see how I was confusing EMF magnetic field, but I thought I was being clear by also mentioning the electric field as being the established circuit voltage. I believe someone else put it, a currentless voltage.