#### Transcript Ivan Lomachenkov

```Ivan Lomachenkov
The electromagnetic rotation of
water
The rotation of water in magnetic and
electrical fields demonstrates the
effect of a magnetic force on charged
particles. It’s a simple equipment.
The equipment:
• cylindrical glass vessel (about 10-15 cm
diameter);
• two electrodes (central and circular
electrode);
• magnet (preferably a cylinder);
• source of electricity (about 10-15 V);
• ampere meter, voltmeter;
7/21/2015
CERN HST2001
The physical picture:
• Put some salt into the water (either NaCl or
CuSO4), about 5-10%. Therefore we have the
electrolyte:
H2O + NaCl=>Na+ + ClThe positive and negative ions begin to move in
the radial direction but the magnetic force acts
perpendicular to the ion’s trajectory. Hence the
water starts to rotate.
7/21/2015
CERN HST2001
The scheme of the facility:
Na+
B
-
+
magnet
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CERN HST2001
+
E
Some estimates:
• It is not difficult to estimate the radial velocity of
the ions of Na. The result is vr~ I/n, where I is
the current and n is the concentration of the ions.
For a current ~ 0.1 A we have vr~ 10-7m/s.
• We can also estimate the circular component of
the velocity: v~ nvrB/, where  - the viscosity
of the solution. For inductance B~10-2 T and
~10-3kg/(m·s) the result is v ~ 10-2 m/s.
• A visible observation confirms this estimation.
7/21/2015
CERN HST2001
```