A current feed apparatus comprising: a feed core including a main feed unit having a predetermined width in a width direction and length in a length direction, feed projection units (314, 315, 316) projected from the main feed unit, which feed projection units are arranged perpendicular to both said width direction and said length direction of the main feed unit, and comprise a first feed projection unit at a first, left, end of said main feed unit and a second feed projection unit at a second, right, end of said main feed unit (312; 612) as seen in the width direction, and a middle feed projection unit arranged in a middle of the main feed unit seen in said width direction and projecting in the same direction as the first and second feed projection units, said first end being opposite to said second end such that said main feed unit and said first, second and middle feed projection units form an E shape; and feed lines being wound on the feed core, characterized in that said feed lines comprising a pair of feed lines comprising a first, left, feed line and a second, right, feed line, arranged such that said first, left, feed line is wound on the first, left, end of the main feed unit in the length direction of the feed core adjacent to the first feed projection unit, and said second, right, feed line is wound on the second, right, end of the main feed unit in the length direction of the feed core adjacent to the second feed projection unit; and said middle feed projection unit having no feed line wound on it. a feed core including a main feed unit having a predetermined width in a width direction and length in a length direction, feed projection units (314, 315, 316) projected from the main feed unit, which feed projection units are arranged perpendicular to both said width direction and said length direction of the main feed unit, and comprise a first feed projection unit at a first, left, end of said main feed unit and a second feed projection unit at a second, right, end of said main feed unit (312; 612) as seen in the width direction, and a middle feed projection unit arranged in a middle of the main feed unit seen in said width direction and projecting in the same direction as the first and second feed projection units, said first end being opposite to said second end such that said main feed unit and said first, second and middle feed projection units form an E shape; and feed lines being wound on the feed core, characterized in that said feed lines comprising a pair of feed lines comprising a first, left, feed line and a second, right, feed line, arranged such that said first, left, feed line is wound on the first, left, end of the main feed unit in the length direction of the feed core adjacent to the first feed projection unit, and said second, right, feed line is wound on the second, right, end of the main feed unit in the length direction of the feed core adjacent to the second feed projection unit; and said first, left, feed line is wound on the first, left, end of the main feed unit in the length direction of the feed core adjacent to the first feed projection unit, and said second, right, feed line is wound on the second, right, end of the main feed unit in the length direction of the feed core adjacent to the second feed projection unit; and