A permanent magnet or electromagnet bent into the shape of a horseshoe or having a U-shape to bring the two poles near each other .
(A permanent magnet or electromagnet; bent; into the shape of a horseshoe) (A permanent magnet or electromagnet; having; a U-shape to bring the two poles near each other)
A permanent magnet or electromagnet A permanent magnet or electromagnet
bent having
into the shape of a horseshoe
a U-shape to bring the two poles near each other