The electromagnetic rotation of water 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; 4/17/2019 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. 4/17/2019 CERN HST2001

The scheme of the facility: Na+ - B E - + + magnet 4/17/2019 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. 4/17/2019 CERN HST2001