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in Physics by (25.3k points)
l लम्बाई के एक तर में i धारा प्रवाहित है । तार को मोड़ कर एक फेरे वाला वृत्तीय लूप बनाने पर, लूप के केंद्र पर उतपन्न चुंबकीय क्षेत्र B है । इस तार से 2 फेरों का लूप बनाये पर, लूप के केंद्र पर उत्पन्न चुंबकीय क्षेत्र होगा:
A. 2B
B. 4B
C. `B//2`
D. `B//4`

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