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`1*0` सेमी`xx1*5` सेमी माप की आयातकार कुण्डली में तार के 30 फेरे हैं । यदि इसमें `1*0xx10^(-4)` ऐम्पियर की धारा प्रवाहित की जाये तो इसका चुम्बकीय आघूर्ण क्या होगा ?

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सूत्र -M=nIA
दिया है - `I=1*0xx10^(-5)` ऐम्पियर, n =30 फेरे,
`A=1xx1*5=1*5 "सेमी"^(2)=11*5xx10^(-4) "मीटर"^(2)` सूत्र पर मान रखने पर ,
`M=1*0xx10^(-4)xx30xx1*5xx10^(-4)=45xx10^(-8)`
`=4*5xx10^(-7) "ऐम्पियर - मीटर"^(2)`|

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