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एक छड़ चुम्बक की ध्रुव सामर्थ्य 3 .2 ऐम्पियर- मीटर तथा अनुप्रस्थ काट का क्षेत्रफल 0 .80 सेमि ` ""^(2 )` है|छड़ के भीतर चुम्बकन की तीव्रता ज्ञात कीजिए|

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चुम्बकन की त्रीवता `I=(m)/(A)`
यहाँ 3.2, एम्पियर-मीटर A=0.80 सेमि`""^(2)` =`0.80xx10^(-4)` मीटर
`therefore I=(3.2)/(0.80xx10^(-4))=4xx10^(4)` एम्पियर/मीटर

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