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.

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    I'm voting to close this question as off-topic because it's off-topic for the site. – Nimesh Neema Sep 13 '18 at 5:38
  • Isn’t the forum supposed to answer hardware questions? Or is there anything else wrong with it? – innocent rock Sep 13 '18 at 5:39
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    Question regarding why and what Apple did encourages opinionated discussions are not under the purview of Ask Different. – Nimesh Neema Sep 13 '18 at 5:40
  • But as I said, this question seems “opinionated” but it’s just a science question. Anyways, do what you think is right buddy. – innocent rock Sep 13 '18 at 5:42
  • Asking why Apple does something is off topic. Instead, please edit this to rephrase the question in the form “given that Apple has done X, how can I do Y” making a practical thing you wish to do can bring this sort of question on-topic for this site. – bmike Sep 13 '18 at 6:21

It is the size,

to obtain same magnetic force with Electromagnet as Permanent its size would not fit in to allowed space.

The other one would be unnecessary power consumption.

Finally, what is the benefit to the end user other then higher cost ?

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