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Transcript
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; 5/22/2017 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. 5/22/2017 CERN HST2001 The scheme of the facility: Na+ B - + magnet 5/22/2017 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. 5/22/2017 CERN HST2001