As the title suggests.
Does direct current running through a circuit become alternating current if it goes through a linear line of alternating magnetic fields of permanent magnets, such as that of a Halbach array?
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\$\begingroup\$ DC remains DC. AC may be induced but the DC will remain the same. \$\endgroup\$– Andy akaCommented Nov 12, 2021 at 20:40
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1\$\begingroup\$ @Transistor's answer is almost certainly correct, but we need a physical sketch to be sure -- unless it's as simple as a wire laying on top of a Halbach array, in which case you need to edit your question with that information, or if the wire is moving with respect to the array in which case you probably need a diagram, and in any case you need to edit your question with that information. \$\endgroup\$– TimWescottCommented Nov 12, 2021 at 21:58
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Faraday's laws of electro-magnetic induction came from his realisation that "spatially varying (and also possibly time-varying, depending on how a magnetic field varies in time) electric field always accompanies a time-varying magnetic field". In your proposal the magnetic field is static. It does not vary with time so there will be no effect on the current through the wire.
answered Nov 12, 2021 at 20:40