Re: [CAD_CAM_EDM_DRO] Re: floating aluminium

Ahh, I realise where I made the mistakes. So... can I buy some of this high
temperature super-conductor? :-)

John H.

> info.host@... wrote:
>
> > MRI's need to be super-cooled? He he he, they'd look much better that

way

> > with the fluid mystically boiling off in big clouds. I heard of a team
> > managing to put together a super-conductor that works very close to room
> > temperature, there was even one in Focus that claimed to have one at

room

> > temperature and was investigating it to be sure. How is there such a

massive

> > current/field at zero volts and zero ohms? I mean, why is there any

force on

> > the electrons to move if there is no difference from where they're at

and

> > where they're going?
>
> One of the mysteries of physics! And, in fact, they really don't

understand

> it very well. The classic 4-9 K superconductors were thought to be well
> understood, but they just came up with a new superconducting alloy that
> has a critical temperature higher than anyone though possible for that

class

> of superconductor. The "high temp" superconducting oxides are not fully
> understood, but progress is being made.
>
> > I take it electrons have to move through some
> > resistance to produce a magnetic field
>
> No, they don't. Electric current (either electrons, protons or their

anti-particles)

> need to move in space to create a magnetic field. That is all that is

required.

>
> > or else capacitors would be
> > incredibly big magnets wouldn't they?
>
> No, they won't, as a capacitor stores CHARGE, and doesn't particularly
> organize the motion of the charges. When it is charged up, it holds the

charge,

> but the charge carriers are NOT moving.
>
> An electromagnet is designed to organize the movement of charge carriers
> so that their magnetic fields add up constructively to a large field.
>
> > In school we did a thing about
> > magnetism, as well as those damned elastic bands, and we listed one of

the

> > factors affecting it as resistance in the wire.
>
> The current in the circuit IS affected by resistance. But, the resistance

does

> not affect magnetic field, only the current. If the circuit has more

resistance,

> you need to supply move voltage to get the same current.
>
> Jon
>
>
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