बायो सेवर्ट का नियम||bio savart ka niyam||चुटकियों में समझे||by Dev sir 

बायो सेवर्ट का नियम||bio savart ka niyam||चुटकियों में समझे||by Dev sir
Namskar doston-mai Dev gupta aap sabhi logo ka Hahmare RU-vid channel Dev Academy math me swagat hai
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