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mrrobinson (0:02)
3 months ago 0 + -flipping the switch causes current to flow in the "bobbin". This movement of charge generates a magnetic field.
mrrobinson (0:03)
3 months ago 0 + -The iron "core" reinforces the magnetic field of the bobbin.
mrrobinson (0:03)
3 months ago 0 + -The changing magnetic field induces a current in the aluminium ring
mrrobinson (0:02)
3 months ago 0 + -It's an alternating current so the magnetic field is constantly changing
mrrobinson (0:04)
3 months ago 0 + -The induced current in the aluminium ring generates a magnetic field that opposes the field from the bobbin/iron core. So it repels off the top!
LENZ'S LAW