Alina made a choice she would never fully explain to her university's ethics board. She opened her phone, aimed it at the screen, and began recording a video. Not of the text—that was unreadable at that distance—but of the diagrams. She panned slowly over the Recursive Flux Mirror schematic, whispering the component values: "47 microfarads, 100 turns, 22-gauge, core material: unknown, marked only as 'K-7H.'"

The "UPD" versions often include references to software tools that help predict how a magnetic component will perform in a 3D environment before a prototype is even built. Practical Benefits for Engineers

: Older editions (like the 4th edition) are sometimes available for digital borrowing on the Internet Archive .

: Covers Ampère's Law, magnetic field strength, and the foundations of inductive components.