Electromagnet

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विद्युत धारा के प्रभाव से जिस लोहे में चुंबकत्व उत्पन्न होता है, उसे विद्युत चुंबक (Electromagnet) कहते हैं। इसके लिये लोहे पर तार लपेटकर उस तार से विद्युत् धारा बहाकर लोहे को चुंबकित किया जा सकता है।

Note:- (लोहे पर चुंबक रगड़कर लोहे को चुंबकीय किया जा सकता है जो विद्युत चुम्बकत्व नहीं है)

 
चुम्बकीय पदार्थों पर लगने वाला बल
   
जहाँ:
💞 F, बल (न्यूटन में)
💕 B , चुम्बकीय क्षेत्र (चुम्बकीय फ्लक्स घनत्व) (टेस्ला में)
💞 A, पोल का क्षेत्रफल (m² में);
💕  , निर्वात की चुम्बकीय पारगम्यता

         💞हवा की पारगम्यता = 


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