चुम्बक
(aangrezi:Magnet) lagabhag 600 ee.poo. eshiya mainar ke 'maignishiyam' namak sthan mean kuchh aise patthar paye gaye, jinamean lohe ke chhote-chhote tuk doan ko apani or akarshit karane ke gun maujood the. ye parthar lohe ke ek aauksaid 'maiganetait' (Fe3O4) ke the. chooanki ye patthar maiganishiya namak par paye gaye, isalie inhean 'maiganet' kaha jane laga. maiganet ko hindi mean 'chumbak' kahate haian. isake dvara lohe ke tuk deoan ko apani or akarshit karane ke gun ko chumbakatv kahate haian. chumbakoan ko yadi svatantrapoorvak lataka diya jaye to sadaiv uttar-dakshin disha ki or sanketit hote haian. prakriti mean svatantr roop se paye jane vale chumbakoan ki akarshan shakti bahut kam hoti hai tatha unaki koee nishchit akriti nahian hoti. ajakal chumbak kritrim vidhiyoan se banaye jate haian tatha ye chumbak mukhyatah kohe, ispat adi dhatuoan ke bane hote haian. inaki akarshan shakti adhik hoti hai. inhean kritrim chumbak kahate haian.
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tika tippani aur sandarbh