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Magnetic effects around ionic conductors

Experiment:   Electric current around ionic conductor

Let’s consider a circuit like in fig. 1 formed by a DC source, an ionic conductor, and a metallic conductor with the same section like ionic conductor. The length of PM side is about 40 cm and both metallic conductor and ionic conductor present the same length and the quite the same transversal section. The ionic conductor is made by a sectioned tube with an appropriate volume of liquid (see an increased view of transversal section in fig. 1). For the simplicity of interpretation, the experiment is made with a KCl solution (both ions have quite the same mobility in solution).

magnetic-current-arround-ionic-conductor

 

Figure 1. Electric current measurement

As far the electric current into a circuit containing a solution is smaller due to the resistance opposed by solution, a powerful DC source is needed. With a source able to deliver at least 12 V and 3 A, the magnetic effects around PM portion of the circuit are observed using a common magnetic needle. In case the ionic conductor is made by a circular plastic tube, the current must be even greater because magnetic field around ionic conductor is shielded by the plastic tube.

In our experiment magnetic effects are observed for both portion of metallic and ionic section of circuit (the magnetic needle is perturbed from its N-S alignment and rotates in conformity with direction of electric current delivered by DC source).

Let us change the solution with a sulfuric acid solution. In this case, from electrochemistry, we know that mobility of proton (cation) is much higher then mobility of sulfuric species). Even in this case, the magnetic field around ionic conductor has the same direction like the magnetic field around metallic part.

Even another possibility, let us consider a solution of KOH as electrolyte. In this case the mobility of hydroxyl anions is 3 times bigger then mobility of potassium cation. Again, the magnetic field around ionic part of circuit keeps the same direction like the magnetic field around the metallic part of circuit.   

The obtained results seem to be in agreement with other replications of this experiment. As comparison a similar experiment described in a well known experimental book - Chemical Demonstrations, (vol IV, Bassam Shakhashiri, Chapter 11.1. - Magnetic field from a conducting solution) is presented below:

….Place the transparent magnetic compass on the overhead projector. Lay the copper wire over the compass and align it so that it is parallel with the compass needle. Clip one of the leads from the battery to one end of the wire. Touch the other led to the other lead of the wire. When contact is made, the compass needle will rotate until it is perpendicular to the wire. Remove the lead from wire and the needle will return to the prior positions. Unclip the battery lead from the one end of the wire and reattach to the other end of the wire. Touch the second lead to the opposite end of the wire. This time the compass needle will rotate in the opposite direction to become perpendicular to the wire. Disconnect the battery and the compass needle will return to its original position. Remove the wire from the projector.
Set the stand holding the tube of 2M H2SO4 on the overhead projector. Align the horizontal section of the tube so that it is parallel with the needle immediately over the compass. The bottom of the tube should be touching the top of the compass. Connect one lead from the 12 V power supply to one of the electrode in the tube. With the power supply turned off, connect the other lead to the other electrode. Turn on the power supply. The compass needle will immediately turn until it is perpendicularly to the tube. Turn off the power supply. The compass needle will return to its original position. Reverse the connection of the power supply. The compass needle will rotate in opposite direction to become perpendicularly on the tube . Turn off the power supply and the needle will return to its original position…..

 Discussion:
This demonstration shows one of physical effects of the passage of an electric current, namely, an electric field.
The flow of electric current produces a magnetic field, weather the current flows through a metallic conductor in the forms of electrons or through an electrolyte solution in the forms of ions.
The magnetic field is detected in this demonstration with a magnetic compass. When the needle is placed in a magnetic field, it aligns itself parallel with the field. In absence of the other fields, the earth’s magnetic field causes the needle to align it self in a north south direction.
The connection between electric current and magnetic phenomena was observed in 1819 by Oersted. He saw the same effect shown in this demonstration that a magnetic needle moved when an electric current flowed through a nearby wire.
A moving electric charge generates a magnetic field. This magnetic field will interact with any other magnetic field. All atoms contain moving charges, namely, the electrons that surrounds the nucleus.
When a compass is placed in a magnetic field, the needle aligns itself with the field. Because Earth has a week magnetic field orientated along its axis of rotation, a compass usually align to this axis unless the compass is placed in a field stronger then that of earth.
In this demonstration the compass is placed in a magnetic field created by an electric current flowing in North South direction. When a current flows in the wire the magnetic compass rotates out of the north south alignment. This indicate that magnetic field created by electric current is greater then earth magnetic field, and has another direction, more precisely, the field is perpendicular on the direction of current flow. The direction in which the compass needle turns also depends on the direction on current flows.
The compass needle deflects when a voltage is applied between electrodes in a nearby solution. This indicates that electric charges are moving into the solution. These moving charges are ions: positive hydrogen and negative sulfate.
The electric conductivity of an electrolytic solution is not as great as that of a metal. Therefore, the voltage applied between the electrodes must be greater then that applied to the wire, in order to produce a similar electric current in the two conductors.
In spite of the higher voltage, the current in the solution is likely to be only a tenth of that in the wire. The weaker current in the solution will produce a weaker magnetic field, so the compass needle may not rotate as far or as quickly as it does near the conducting wire. This causes the magnetic field produced by the current in the solution to be more diffuse that near the wire. This too will contribute to a less dramatic rotation of the needle. Therefore it is necessary to place the tube of conducting solution as close to the compass needle as possible.When current flows through a solution, two types of conductions occur. In the solution, the movement of ions conducts the electric current. Sulfate anions move in one direction and hydrogen ions move in opposite direction. In the wire connected to the electrons and in electrodes the current is conducted by moving electrons. At the surface of electrodes, the current changes from electron carried to ion carried. This transformation is possible only if all electrons are added or removed from ions.

Such addition and removal from ions result in chemical transformation

What a nice presentation,  but what an absurd interpretation …..

For simplicity, I will start with expected result when a KCl solution is used in ionic conductor. As far the mobility of K species (0.000670) is quite the same like mobility of chlorine species (0.000678), their opposite movements will have as result a double magnetic effect (fig. 2). Harald von Linden (EPFL ) pointed out that here there was an error, so I corected the picture and the value of B.  

 

magnetic effect corrected

Figure 2. Charge displacement inside metallic and ionic conductor

What should happen when a sulfuric acid solution is used in ionic conductor?

In this case, as far hydrogen positive species moves faster then sulfuric species, the magnetic field around ionic portion of circuit must be somewhere between B and 2B as value.  Is this value observed into practice?  

 

The experimental results rule out completely the actual interpretation for ionic effect of charges movement. If after a time interval the speed of both cations and anions becomes equal, there is an overlap with previous situation ….

What should happen when KOH solution is used as ionic conductor?

In this case the mobility of potassium species is smaller then mobility of hydroxyl species and again the value of magnetic field arround ionic part must be somewhere between B and 2B as value. 

 

 

A new basement for electromagnetism as a whole has to be frame out and this work has been started around 2005. In this time interval, the official science has done everything possible to obstruct it and to spend as much money as possible on stupidities…

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