A reactor according to this invention comprises an annular iron core constituting a closed magnetic path and a conductor wound on 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 {HEAD ~ 0.3 to 0.8%} of {TAIL ~ oxygen} by weight based on the particle 
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A reactor according to this invention comprises an annular iron core constituting a closed magnetic path and a conductor wound on 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 { HEAD ~ 0.3 to 0.8 % } of { TAIL ~ oxygen } by weight based on the particle
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