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in Physics by (25.3k points)
एक दण्ड चुम्बक को रुई के पतले धागे से एकसमान क्षैतिज चुम्बकीय क्षेत्र में samyavstha में लटकाया गया है। इसे `60^(@)` से घुमाने के लिये आवश्यक ऊर्जा W है। अब चुम्बक को इस नयी स्थिति में बनाये रखने के लिये आवश्यक बल-आघूर्ण होगा :
A. `sqrt(3) W`
B. W
C. `(sqrt(3)W)/(2)`
D. 2 W

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