When a thick aluminum ring and a thin aluminum ring are opposed by a magnetic force and allowed to jump, the key factor that influences their behavior is the concept of electrical currents and resistance.
When a magnetic field changes near a conductor, it induces an electric current within the conductor. This current, in turn, generates a magnetic field that opposes the original magnetic field. According to Lenz's law, the induced magnetic field will always act to oppose the change in the magnetic field that caused it.
Now, when the rings are exposed to the magnetic field, the induced electric currents are generated in both rings. However, due to the differences in resistance and the skin effect, the behavior varies:
-- Thick aluminum ring: The lower resistance allows a larger current to flow through the thick ring. As a result, the induced magnetic field generated by this current is stronger. According to Lenz's law, this stronger magnetic field creates a greater opposing force to the applied magnetic force, causing the ring to jump higher until we put it in liquid nitrogen.
-- Thin aluminum ring: The higher resistance in the thin ring restricts the flow of current. Consequently, the induced magnetic field generated is relatively weaker. Therefore, the opposing force to the magnetic field is also weaker, resulting in a lower jump height compared to the thick ring. That is, until we add it to liquid nitrogen.
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