When an aluminum ring is placed on ring launcher so that it surrounds the coil,

Question

When an aluminum ring is placed on ring launcher so that it surrounds the coil, it flies upward
when a AC current is applied to the coil. This does not occur when the intact ring is replaced
by a split ring (see below).
Explain this in 3 sentences or less. Feel free to use as many diagrams and equations as you
need in your explanation. [Warning: The standard explanation of this lacks any mention of an
essential feature.]

I'd really appreciate it if you could include this "essential feature" my Professor is looking for in order for me to receive full credit. I've attached a picture showing the figures. Thank you in advance!

Explanation / Answer

Assume that the ring launcher is a magnetic field generator, so when current is applie to the ring, a force is generated in cuurnt carrying coil, causing it to fly away, but for a split ring, the current cannot be introduced in the ring, hence force on non current carrying conductor in a magnetic field = 0, hence split ring does not fly away

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