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एक छड़ (दण्ड) चुम्बक की लम्बाई 'l' है और इसका चुम्बकीय द्विधूव बल - आघूर्ण 'M' है। यदि इसे आरेख (चित्र) में दर्शाए गए अनुसार एक चाप के आकार में मोड़ दिया जाय तो, इसका नया चुम्बकीय द्विधुव बलाघूर्ण होगा-

चुम्बकीय द्विधुव

(A) M

(B) \(\frac{3}{\pi}\) M

(C) \(\frac{2}{\pi}\) M

(D) \(\frac{M}{2}\)

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