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. =20
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,







Hi Folks,  I have used a simple =
tubular coil=20
and ring magnet assm. in a number of sensors.   Yet I still =
have=20
unanswered questions about Faraday's Law.
 
=
http://hyperphysics.phy-astr.gsu.edu/hbase/electric/farlaw.html =
 =20
I have never taken the time to test all the configurations, but now is a =
good=20
time.   Before I begin I wanted to ask someone, who understand =
it or=20
who actually has done these tests.
 
Here are my=20
questions...............Looking at this wed page, there is a simple, =
tubular=20
coil.   The illustration shows only one pole of the magnet =
entering=20
the coil.   The formula and examples I believe I=20
understand.    However What happens, when both =
poles are=20
inside the coil, say a small ring magnet 1/4" thick.   =
Now things=20
are not clear.   Is there a cancelling =
effect?    With=20
both north and south poles inside the coil, I would think this would be =
the=20
case.    To keep this understandable, let's not consider =
any=20
magnets on the outside of the coil.
 
I see these =
possibilities.  
1 One pole entering the coil, as shown, =
when it=20
move in one direction it produces + voltage, when it move in the =
opposite=20
direction, - voltage.  This is the only arrangement I have=20
used.
2. Both poles inside the coil, when it =
move in one=20
direction.........?   When it moves in the opposite=20
direction....?
3. Two magnets, one entering and one =
exiting, with=20
like poles facing each other.   When they move, at the same=20
time, in one direction..........?  When they move, at the same =
time,=20
in the other direction?
4.  Two magnets, one entering and =
one exiting,=20
with opposite poles facing each other.  When they move, at the same =
time,=20
in one direction....?  When they move, at the same time, in the =
other=20
direction?
 
I am going to run this simple =
test........but would=20
like someone to explain, before,  what I should see.
 
Thanks,
Ted