[hamdani yusuf (OP)]

Moving the wire in the same direction(or the reverse) as the current flow will not affect the charge. All other movements will have some affect.

What about moving the charged ball in the same direction(or the reverse) as the current instead?

[hamdani yusuf (OP)]

Let's make a test case to make it clear and unambiguous. A small metal ball charged with +1 Coulomb is hung up and stationary in the frame of a lab.

No, it isn't.
Let's imagine a "small" metal ball about the size of a football pitch- 100 metres in diameter
The capacitance of an isolated sphere is given by
so its capacitance C=4πε0R

So, with R= 50 C= 5.6 picofarads.
Q = C V so if Q=1 and C= 5.6 X 10^-9, V= 178 MV.
Where do you plan to get your 178 megavolt power supply from?
(and it gets worse if you reduce the size of the ball.)

A small Van de Graaf generator can produce around 100kV. Without significantly changing the qualitative interaction between the ball and the wire, you can reduce the electric charge to milli or even micro Coulomb.

[alancalverd]

You seem to be unaware that the electric current is alternating. The frequency is 50 Hz.

Ohm's Law still applies. If the wire is a perfect conductor (and you haven't suggested otherwise) the voltage across it will be zero at all times.

[alancalverd]

For many purposes you can treat an electrolytic cell as a near-constant-current device,

I have seen plenty of batteries with a voltage written on them. But I don't think I have seen one which purports to deliver a constant current.

HY's diagram shows a driving voltage source outside of the cells, and gives no details of the electrodes which we must therefore assume to be identical, so no "battery" is involved. The current is partly determined by the area of the electrodes.

[hamdani yusuf (OP)]

I also see a voltmeter connected between the stands?

This is partially inspired by electrostatic induction in electroscope.

But instead of detecting electrostatic force, my experiment was designed to measure the small difference in electrodynamic forces between two ionic currents.

[hamdani yusuf (OP)]

I can't figure out the purpose of this setup or where this could lead to a conflict with standard theory. Also why two different electrolytes?       

The working principles of the setup may not be obvious at a glance. Otherwise, it must have been built centuries ago.

The electrolytes are selected to provide difference in ionic current, where mass to charge ratio are different and cause electrodynamic forces to the metal cans below them.

[hamdani yusuf (OP)]

You seem to be unaware that the electric current is alternating. The frequency is 50 Hz.

Ohm's Law still applies. If the wire is a perfect conductor (and you haven't suggested otherwise) the voltage across it will be zero at all times.

Look again carefully. Where the leads of the Voltmeter are connected to?

[alancalverd]

Either earth potential or the two cans of electrolyte which are connected together by a piece of wire. V = 0 in either case.

[paul cotter]

Collinear travel of the wire does not move the B field: if it did one would expect simple rotation of the magnet in the homopolar generator to produce an output- it does not.

[hamdani yusuf (OP)]

Either earth potential or the two cans of electrolyte which are connected together by a piece of wire. V = 0 in either case.

Then you model doesn't represent physical reality, because in reality, the voltmeter shows non-zero value. And it changes when the current is flowing through the liquids.

[alancalverd]

I was looking at the drawing in Reply #224 above.

[hamdani yusuf (OP)]

Collinear travel of the wire does not move the B field: if it did one would expect simple rotation of the magnet in the homopolar generator to produce an output- it does not.

Principle of relativity requires that it doesn't matter which one is moving, the ball or the wire. What matters is their relative velocity against each other.

Moving the wire in the same direction(or the reverse) as the current flow will not affect the charge. All other movements will have some affect.

What about moving the charged ball in the same direction(or the reverse) as the current instead?

[hamdani yusuf (OP)]

I was looking at the drawing in Reply #224 above.

So we're referring to the same thing, when I said this.

Either earth potential or the two cans of electrolyte which are connected together by a piece of wire. V = 0 in either case.

Then you model doesn't represent physical reality, because in reality, the voltmeter shows non-zero value. And it changes when the current is flowing through the liquids.

[hamdani yusuf (OP)]

There are some patterns identified in the third table.

Positive values mean that positively charged test particle will be pushed away from the wire. While negative values mean it will be pulled towards the wire.

Zeros mean that the test particle doesn't experience any force. It happens when the current is 0, or the speed of the wire is 0.

There are more positive values than negative values. Thus if the velocities of particles in the wire are random, it's more likely for the test particle to be pushed away.

When the electrons in the wire are kept stationary, the Lorentz force to the test particle is proportional to the square of wire's speed.

Can these patterns be explained using length contraction and time dilation?

Most of us aren't aware of the boldened statement above.

[paul cotter]

(1) the B field does not move with the wire, lengthways(collinear). (2) how can there be more positives than negatives in a neutral piece of matter?

[hamdani yusuf (OP)]

(1) the B field does not move with the wire, lengthways(collinear).

Do you think that relativity principle is wrong?
If the ball is the one moving along the length of the current carrying wire, will it experience force?

[hamdani yusuf (OP)]

(2) how can there be more positives than negatives in a neutral piece of matter?

You need to learn something about electrostatic precipitation.

[paul cotter]

You need to learn some basic physics.      PS: I give up, this is utterly pointless, I don't know why I rejoined the argument. I'm out.

[Bored chemist]

For many purposes you can treat an electrolytic cell as a near-constant-current device,

I have seen plenty of batteries with a voltage written on them. But I don't think I have seen one which purports to deliver a constant current.

HY's diagram shows a driving voltage source outside of the cells, and gives no details of the electrodes which we must therefore assume to be identical, so no "battery" is involved. The current is partly determined by the area of the electrodes.

I was using a battery as a well known example of an electrolytic cell which is not a constant current device.

Would you  like to suggest an example which is?

[hamdani yusuf (OP)]

You need to learn some basic physics.      PS: I give up, this is utterly pointless, I don't know why I rejoined the argument. I'm out.

In scientific discussions, the participants are required to ponder the implications of their assumptions and prior conclusions that they believe to be correct. Then they must check if the implications are compatible with observational results. Otherwise, they will only be talking pass to one another unintelligibly.