A solenoid having 400 turns per metre has a core of a material with relative permeability 400. When a current of 0.5 A is passed through it, the magnetization of the core material in Am ⁻¹ is nearly

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Correct answer: D. 8 10^4

Magnetic intensity, H = nI =400 0.5=200 Am ⁻¹ _ r =1+ = ( _ r -1 ) aligned M = H & = ( _ r -1 ) H =(400-1) 200 & =7.98 10^4 Am ⁻¹ & 8 10^4 Am ⁻¹ aligned

A solenoid having 400 turns per metre has a core of a material with relative permeability 400. When a current of 0.5 A is passed through it, the magnetization of the core material in Am ⁻¹ is nearly

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