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नीचे दिये गये प्रश्न के लिए अनुच्छेद

A bar magnet of magnetic moment M is suspended in a uniform magnetic field B with the help of a string in equilibrium position as shown in the figure.

M चुम्बकीय आघूर्ण वाले एक दण्ड चुम्बक को चित्रानुसार एक डोरी द्वारा एकसमान चुम्बकीय क्षेत्र B में साम्य स्थिति में लटकाया जाता है।

Q. The work done by the external agent to rotate (slowly) the bar magnet by 180° is

प्रश्न - बाह्य कारक द्वारा दण्ड चुम्बक को 180° तक घुमाने (धीरे-धीरे) में किया गया कार्य है


A
Zero

शून्य
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B
3MB2
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C
2MB
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D
MB
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Solution

The correct option is C 2MB
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