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Transcript
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