A reactor according to this invention comprises {TAIL ~ an annular iron core} constituting a closed magnetic path and a conductor wound on {HEAD ~ the iron core}, the iron core being formed of particles of iron or an iron based magnetic material each covered with an insulative oxide film containing 0.3 to 0.8% of oxygen by weight based on the particle 
A reactor according to this invention comprises { TAIL ~ an annular iron core } constituting a closed magnetic path and a conductor wound on { HEAD ~ the iron core } , the iron core being formed of particles of iron or an iron based magnetic material each covered with an insulative oxide film containing 0.3 to 0.8 % of oxygen by weight based on the particle
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