"magnetic induction"@en . _:b19590 . _:b19548 . . _:b19548 . _:b19590 . "magnetic flux density"@en . . _:b19590 . . _:b19590 . . "magnetic field"@en . . . . . . . . . . . . . _:b19549 . . . _:b19548 . . . . "B" . . . . _:b19549 . _:b19548 _:b19549 . _:b19549 .