Back to Basics

[Grumpy]

It is radial and spirals around the wire. It isn't circular. If so, it would be a monopole, wouldn't it 

Thanks BEP.  This is why I brought it up in the first place.

When I first posed the question at the start of this thread, I wanted to see if anyone knew that there are two opposite "things" that flow before the electrons drift. Wheatstone proved that there is a "flow" of "something" from each end of the circuit in an experiment with three spark gaps in series.  The center (second) gap always arcs after the first and third gaps - contrary to the linear propagation we are taught to believe.

Does the north pole of a compass always point toward a wire carrying current or does the south pole point to the wire half in half of the circuit?  In other words, does the mag field along the wire ever flip?

[BEP]

I'll try to answer later. Right now I'm supposed to be out solving other's problems before they happen 

[Spider]

Reminds me of this:

http://www.rexresearch.com/szili/szili.htm


Spider

[BEP]

Wheatstone proved that there is a "flow" of "something" from each end of the circuit in an experiment with three spark gaps in series.  The center (second) gap always arcs after the first and third gaps - contrary to the linear propagation we are taught to believe.

I wonder how many have seen this. Most wouldn't believe it if they did.

Does the north pole of a compass always point toward a wire carrying current or does the south pole point to the wire half in half of the circuit?  In other words, does the mag field along the wire ever flip?

This is an interesting point. A confusing one too.

In a single conductor the compass points across the wire, if it is centered on the wire. DC, AC, and pulses confuse it too. Anything but DC (not pulsed) may show a flip between nodes and anti-nodes if the frequency is high enough.

Drop a small doughnut magnet onto a steel rod of good length. It will rotate as it drops. If the rod is long enough the spin will change direction. This happens even if you magnetize the rod with one polarity from end to end. I once thought this was due to rod manufacture or metal imperfections.
Not so. Even after I anneal the rod while pointing it different directions the same happens.

Later folks. Gotta earn some geld.

[Grumpy]

I wonder how many have seen this. Most wouldn't believe it if they did.

This is an interesting point. A confusing one too.

In a single conductor the compass points across the wire, if it is centered on the wire. DC, AC, and pulses confuse it too. Anything but DC (not pulsed) may show a flip between nodes and anti-nodes if the frequency is high enough.

Drop a small doughnut magnet onto a steel rod of good length. It will rotate as it drops. If the rod is long enough the spin will change direction. This happens even if you magnetize the rod with one polarity from end to end. I once thought this was due to rod manufacture or metal imperfections.
Not so. Even after I anneal the rod while pointing it different directions the same happens.

Later folks. Gotta earn some geld.

There is a little more to the Wheatstone experiment than just two sparks and three gaps.  He was able to measure the velocity at 288,000 miles per second.  This is 1.54 times 186,000 miles per second.  As some of you may recall, Tesla also measured this velocity (or something very close to it) for longitudinal waves.  I don;t recall anyone eery bringing this up before, but several people have mentioned that something flows or propagates from each side of the circuit.  See attached.

On the magnet in a tube, it falls at an angle if the tube is slit.  I can't recall what the explanation was for this.