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An iron rod goes vertically through a solenoid. An aluminum ring is slipped over the rod...

An iron rod goes vertically through a solenoid. An aluminum ring is slipped over the rod down to the solenoid. When the current runs through the solenoid, the ring jumps up. If the current reverses while the ring is rising,

the ring will be pulled back

there will be no effect.

the ring will be pushed up more

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