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एक छोटे दण्ड -चुम्बक के केंद्र से निरक्षीय स्थिति में 20 सेमी दुरी पर `3xx10^(-4)"वेबर /मीटर"^(2)` का चुम्बकीय क्षेत्र उत्पन्न होती है । चुम्बक का द्विध्रुव आघूर्ण ज्ञात कीजिए ।

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सूत्र- `B=(mu_(0))/(4pi).(M)/(d^(3))` या `B=10^(-7)(M)/(d^(3))`
`thereforeM=10^(7)Bd^(3)`
दिया है - d=20 सेमी `=20xx10^(-2)` मीटर ,
`B=3xx10^(-4) "वेबर /मीटर"^(2)`|
सूत्र में मान रखने पर ,
`M=10^(7)xx3xx10^(-4)xx(20xx10^(-2))^(3)`
`=3xx10^(3)xx8xx10^(-3)=24 " ऐम्पियर -मीटर"^(2)`|

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