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Question

A long cylindrical iron core of cross-sectional area 5.00 cm2 is inserted into a long solenoid having 2000 turns/m and carrying a current 2 A. The magnetic field inside the core is found to be 1.57 T. Neglecting the end effects, find the magnetization I of the core and the pole strength developed

A
4.25×106 A/m, 125 Am
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B
2.50×106 A/m, 125 Am
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C
2.50×106 A/m, 625 Am
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D
1.25×106 A/m, 625 Am
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