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L लम्बाई का एक तार , `i` जिसमें ऐम्पियर की धारा प्रवाहित हो रही हैं , एक वृत्त के रुप में मोड़ दिया गया हैं । उसके चुम्बकीय आघूर्ण का मान बताइये ।

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चुम्बकीय आघूर्ण `M = iA = ipir^(2)`
परंतु `2pir = L `
या `r = (L)/(2pi)`
`M = ipi((L)/(2pi))^(2) = (I L^(2))/(4 pi)`

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