The secondary core, together with the primary core, forms the closed magnetic circuit, in which {HEAD ~ a core main portion} of the secondary core is formed in {TAIL ~ a shape} of straight beam and the end faces at the end of the secondary core located at both ends in the longitudinal direction of the core main portion are held in contact with the primary core 
The secondary core , together with the primary core , forms the closed magnetic circuit , in which { HEAD ~ a core main portion } of the secondary core is formed in { TAIL ~ a shape } of straight beam and the end faces at the end of the secondary core located at both ends in the longitudinal direction of the core main portion are held in contact with the primary core
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