Hi everyone,

 

Here's a question I've always wanted to ask:  Why (if the number of magnetic
lines of force cut per unit time produces a current flow) is it not possible
to force two identical magnets together so that they're oriented (for
example) N pole to N pole.  It seems to me that the lines of force would
crowd together so that the least movement of them would produce quite a
strong response in a coil. 

 

I built a simple vertical seismometer with a 5 pound plumber's lead as the
weight, a spring and two cow magnets forced together in a tube of PVC so
that the resting position in the coil was the point at which the maximum
lines of force resided.  It made a lot of sense when I designed it but I
didn't have a good environment in which to test it; e.g. A 500 foot TV
station antenna within 50 feet; an expressway two blocks away and a location
inside a TV studio.  To be sure, it was a short period sensor.  

 

I'm not a seismologist (that should be quite evident) . I'm a retired
electrical engineer who specialized in grounding and lightning damage risk
mitigation.  In case you're wondering about the TV station stuff, I made my
living as a Meteorologist (my 2nd degree).  If my idea is dumb please excuse
me - I was just very curious about this and thought I'd write and ask.

 

Miguel Lozano

Lockhart, TX, USA

 

From: psn-l-request@.............. [mailto:psn-l-request@............... On
Behalf Of Ted Channel
Sent: Monday, August 09, 2010 9:36 AM
To: psn
Subject: Faraday's Law

 

Hi Folks,  I have used a simple tubular coil and ring magnet assm. in a
number of sensors.   Yet I still have unanswered questions about Faraday's
Law.

 

http://hyperphysics.phy-astr.gsu.edu/hbase/electric/farlaw.html   I have
never taken the time to test all the configurations, but now is a good time.
Before I begin I wanted to ask someone, who understand it or who actually
has done these tests.

 

Here are my questions...............Looking at this wed page, there is a
simple, tubular coil.   The illustration shows only one pole of the magnet
entering the coil.   The formula and examples I believe I understand.
However What happens, when both poles are inside the coil, say a small ring
magnet 1/4" thick.   Now things are not clear.   Is there a cancelling
effect?    With both north and south poles inside the coil, I would think
this would be the case.    To keep this understandable, let's not consider
any magnets on the outside of the coil.

 

I see these possibilities.  

1 One pole entering the coil, as shown, when it move in one direction it
produces + voltage, when it move in the opposite direction, - voltage.  This
is the only arrangement I have used.

2. Both poles inside the coil, when it move in one direction.........?
When it moves in the opposite direction....?

3. Two magnets, one entering and one exiting, with like poles facing each
other.   When they move, at the same time, in one direction..........?  When
they move, at the same time, in the other direction?

4.  Two magnets, one entering and one exiting, with opposite poles facing
each other.  When they move, at the same time, in one direction....?  When
they move, at the same time, in the other direction?

 

I am going to run this simple test........but would like someone to explain,
before,  what I should see.

 

Thanks,

Ted














Hi everyone,

 

Here’s a question I’ve always wanted to =
ask: 
Why (if the number of magnetic lines of force cut per unit time produces =
a
current flow) is it not possible to force two identical magnets together =
so
that they’re oriented (for example) N pole to N pole.  It =
seems to
me that the lines of force would crowd together so that the least =
movement of
them would produce quite a strong response in a coil. =


 

I built a simple vertical seismometer with a 5 pound =
plumber’s
lead as the weight, a spring and two cow magnets forced together in a =
tube of
PVC so that the resting position in the coil was the point at which the =
maximum
lines of force resided.  It made a lot of sense when I designed it =
but I
didn’t have a good environment in which to test it; e.g. A 500 =
foot TV
station antenna within 50 feet; an expressway two blocks away and a =
location
inside a TV studio.  To be sure, it was a short period =
sensor.  

 

I’m not a seismologist (that should be quite =
evident) …
I’m a retired electrical engineer who specialized in grounding and =
lightning
damage risk mitigation.  In case you’re wondering about the =
TV
station stuff, I made my living as a Meteorologist (my 2nd
degree).  If my idea is dumb please excuse me – I was just =
very
curious about this and thought I’d write and =
ask.

 

Miguel Lozano

Lockhart, TX, USA

 





From:=

psn-l-request@.............. [mailto:psn-l-request@............... On =
Behalf
Of Ted Channel

Sent: Monday, August 09, 2010 9:36 AM

To: psn

Subject: Faraday's Law





 



Hi
Folks,  I have used a simple tubular coil and ring magnet assm. in =
a
number of sensors.   Yet I still have unanswered questions =
about
Faraday's Law.





 





=
http://hyperphysics.phy-astr.gsu.edu/hbase/electric/farlaw.html =
 
I have never taken the time to test all the configurations, but now is a =
good
time.   Before I begin I wanted to ask someone, who understand =
it or
who actually has done these tests.





 





Here are=
 my
questions...............Looking at this wed page, there is a simple, =
tubular
coil.   The illustration shows only one pole of the magnet =
entering
the coil.   The formula and examples I believe I
understand.    However What happens, when both =
poles are
inside the coil, say a small ring magnet 1/4" =
thick.   Now
things are not clear.   Is there a cancelling
effect?    With both north and south poles inside the =
coil, I
would think this would be the case.    To keep this
understandable, let's not consider any magnets on the outside of the =
coil.





 





I
see these possibilities.  





1
One pole entering the coil, as shown, when it move in one direction it =
produces
+ voltage, when it move in the opposite direction, - voltage.  This =
is the
only arrangement I have used.





2.
Both poles inside the coil, when it move in one =
direction.........?  
When it moves in the opposite direction....?





3.
Two magnets, one entering and one exiting, with like poles facing each
other.   When they move, at the same time, in one
direction..........?  When they move, at the same time, in the =
other
direction?





4. 
Two magnets, one entering and one exiting, with opposite poles facing =
each
other.  When they move, at the same time, in one =
direction....?  When
they move, at the same time, in the other =
direction?





 





I
am going to run this simple test........but would like someone to =
explain,
before,  what I should see.





 





Thanks,





Ted