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How ferromagnet makes more sense than electromagnet in apple watch charging cable? [Resolved]

I don't see any use of ferromagnet in charging cable of apple watch or macbook (before 2017). Why don't apple opt for electromagnet as it would only be magnetic when the charging code is powered. We would not even need a light indicator as cable would disconnect itself if power is removed.

Question Credit: innocent rock
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Asked September 13, 2018
Posted Under: Apple
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