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एक दण्ड चुम्बक की ध्रुव सार्मर्थ्य 3 .6 ऐम्पियर-मीटर चुम्ब्कीय लम्बाई 12 सेमि तथा परिच्छेद क्षेत्रफल 0 .90 सेमि `""^(2 )` है|ज्ञात कीजिये-
चुम्बकीये आघूर्ण,

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चुम्बक की ध्रुव सामर्थ्य `m= 3.6` ऐम्पियर-मीटर
चुम्बक की लम्बाई `2l=12` सेमि `=12xx10^(-2)` मीटर
परिच्छेद क्षेत्रफल ` A= 0.90`सेमि `""^(2 )` `= 0.90xx10^(-4) ` मीटर `""^(2 )`
चुम्बकीय आघूर्ण ` M=mxx2l =3.6xx12xx10^(-2)`
` " "=0.432` ऐम्पियर -मीटर `""^(2 )`

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