PPD tajziyat karda, voltaj-i tok-i mutaghayir, potentsial-i jam'i va polarizatsion, hamchunin tok-i polarizatsiyai ra tabdil mekunad. Baroi potentsiali polarizatsion imkoniyaati tagyir kardan-i muddat-i ta'khiri shuru'i tabdil ra ba moment-i ikhtitam-i polarizatsiya faraham meorad.
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