Ivan Lomachenkov

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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);

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## Ivan Lomachenkov

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### 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;

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+ + Cl-

The 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.

CERN HST2001

The scheme of the facility:

Na+

-

B

E

-

+

+

magnet

CERN HST2001

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.

CERN HST2001