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I imagine the magnetic field comes from the accretion disk. But what causes it to "spring" upward?

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  • $\begingroup$ Related: physics.stackexchange.com/q/226458/2451 , physics.stackexchange.com/q/39161/2451 $\endgroup$
    – Qmechanic
    Sep 10, 2020 at 4:18
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    $\begingroup$ What do you mean by spring upward? $\endgroup$
    – Triatticus
    Sep 10, 2020 at 4:18
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    $\begingroup$ What does "spring upward" refer to? $\endgroup$
    – joseph h
    Sep 10, 2020 at 4:20
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    $\begingroup$ I imagine the magnetic field comes from the accretion disk. A Kerr-Newman black hole without an accretion disk has a magnetic field, but such a hole isn’t astrophysically relevant as far as we know. $\endgroup$
    – G. Smith
    Sep 10, 2020 at 4:57

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