Date: Wed, 26 Oct 2011 09:20:01

Author: --- "George Herold"

Subject: Re: Image Current Demo

Post:

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Hi Steve, I think that is right. But I'm still tasting a bit of shoe*
from yesterday, so I'm afraid to commit. Image methods are mostly just
used to make computations easier. It would be nice if you could get a
big piece of ferrite (the stuff used to make high frequency coils and
transformers) this would eliminate the eddy current and permanent
magnetization effects. =20
=20
George H. =20
=20
=20
*sticking my foot in my mouth. =20


________________________________

From: tap-l-owner@lists.ncsu.edu
[mailto:tap-l-owner@lists.ncsu.edu] On Behalf Of Steve Wonnell
Sent: Tuesday, October 25, 2011 3:56 PM
To: tap-l@lists.ncsu.edu
Subject: Re: [tap-l] Image Current Demo
=09
=09
Hummm, George, come to think of it, is this effect really any
different from, say, the force that makes an iron core retract into a
solenoid when the current is turned on? -- Steve


You know how if you have an iron core for a solenoid, the core
is pulled into the solenoid when current is run through
=09
On Oct 25, 2011, at 2:15 PM, George Herold wrote:


Just a though on another way to do this. If you have a
nice coil for making B-fields (I'm thinking of 1/2 of a Helmholtz pair.)
And a magnetometer... perhaps a simple hall probe. Then you can put a
current through the coil and make a B-field. Measure the size with the
hall probe. Now bring a large piece of iron near to the coil.. (from
the side opposite side of the hall probe) the field should increase.
(Of course ya gotta make sure the iron isn't magnetized already.) =20
=20
George =20
=20


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Hi=20
Steve, I think that is right. But I'm still tasting a bit of =
shoe*=20
from yesterday, so I'm afraid to commit. Image methods are mostly =
just=20
used to make computations easier. It would be nice if you could =
get a big=20
piece of ferrite (the stuff used to make high frequency coils and=20
transformers) this would eliminate the eddy current and permanent=20
magnetization effects.

George=20
H.


*sticking my foot =
in my=20
mouth.




From: tap-l-owner@lists.ncsu.edu=20
[mailto:tap-l-owner@lists.ncsu.edu] On Behalf Of Steve=20
WonnellSent: Tuesday, October 25, 2011 3:56 =
PMTo:=20
tap-l@lists.ncsu.eduSubject: Re: [tap-l] Image Current=20
Demo

Hummm, George, come to think of it, is this effect really any =
different=20
from, say, the force that makes an iron core retract into a solenoid =
when the=20
current is turned on? -- Steve



You know how if you have an iron core for a solenoid, the core is =
pulled=20
into the solenoid when current is run through

On Oct 25, 2011, at 2:15 PM, George Herold wrote:



Just a=20
though on another way to do this. If you have a nice coil for =
making=20
B-fields (I'm thinking of 1/2 of a Helmholtz pair.) And a=20
magnetometer... perhaps a simple hall probe. Then you can put =
a=20
current through the coil and make a B-field. Measure the size =
with the=20
hall probe. Now bring a large piece of iron near to the coil.. =
(from=20
the side opposite side of the hall probe) the field should =
increase. =20
(Of course ya gotta make sure the iron isn't magnetized =
already.) =20


George


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