Download Ivan Lomachenkov

Ivan Lomachenkov
The rotation of water
The rotation of water in magnetic and
electrical fields demonstrates the
influence of magnetic force on the
charged particles. It’s need the simple
equipment.
The equipment:
• cylindrical glass vessel (about 10-15 cm
diameter);
• two electrodes (central and circular
electrode);
• magnet (it’s desirable cylinder);
• source of electricity (about 10-15 V);
• ampere meter, voltmeter;
5/22/2017
CERN HST2001
The physical picture:
• In water we can put some salt (may be NaCl
or CuSO4, about of 5-10%). Therefore we
have the electrolyte:
H2O + NaCl=>Na+ + ClThe positive and negative ions begin move
in the radial direction but the magnetic
force acts perpendicular to the ion’s
trajectory. Hence the water starts to rotate.
5/22/2017
CERN HST2001
The scheme of the facility:
Na+
B
-
+
magnet
5/22/2017
CERN HST2001
+
E
Some estimations:
• It’s not difficult to estimate the radial velocity of
the ions of Na. The result is vr~ I/n, I- the
current, n- the concentration of the ions. For the
current I~ 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.
• The visible observation confirms this estimation.
5/22/2017
CERN HST2001