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mrrobinson (0:02)
3 months ago 0 + -Flipping the switch causes an alternating current to flow in the "bobbin". This movement of charge generates a magnetic field.
mrrobinson (0:03)
3 months ago 0 + -The changing magnetic field induces a current in the aluminum ring. This induced current creates a magnetic field that opposes the bobbin/iron core field.
mrrobinson (0:04)
3 months ago 0 + -The oposing magnetic fields from the iron core and aluminium ring cause it to "levitate". The angle of the ring is due to the orientation of the iron core field lines.
mrrobinson (0:08)
3 months ago 0 + -Turn off the alternating current and the fields collapse.
mrrobinson (0:09)
3 months ago 0 + -The alumnium ring has low resistance and is only one (1) turn so the induced current is high. So it gets hot!