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