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Though there's no activity, I'll answer it based on my own understanding.
If the electromagnet attracted more metals and it's strongly attracts it.
Remember:
The increased strength of an electromagnet depends on how much copper wire has it, how strong battery is, and how big metal conductor is.
Electromagnet are temporary magnets, meaning if the energy stored on battery is gone, the electromagnet won't work. They use electricity to work.
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