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दो दण्ड - चुम्बक , जिनमें से प्रत्येक की लम्बाई 10 सेमी तथा चुम्बकीय आघूर्ण 2000 C. G.S मात्रक है , इस प्रकार रखे गये हैं कि उनके अक्ष परस्पर लम्बवत हों यदि दोनों चुम्बकों के बीच कि दूरी 24 सेमी हों , तो दोनों चुम्बकों के केन्द्रों के बीच स्थित बिंदु पर परिणामी तीव्रता ज्ञात कीजिए ।

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Correct Answer - `3*54` ओर्स्टेड,
`B_(1)=(M)/((d^(2)+l^(2))^(3//2))=(2000)/((12^(2)+5^(2))^(3//2))`
तथा `B_(2)=(2Md)/((d^(2)-l^(2))^(2))=(2xx2000xx12)/((12^(2)-5^(2))^(2))`
`B_(1)` और `B_(2)` लम्बवत हैं । अतः `B=sqrt(B_(1)^(2)+B_(2)^(2))`
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