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A tightly wound long solenoid having 50...

A tightly wound long solenoid having 50 turns `cm^(-1)` carries a current of 4.00A find the magnetic intensity H and the magnetic field B at the centre of the solenoid what will be the values of these quantities if an iron core is inserted in the solenoid and the magnetization (I) in the core is `4xx10^6 Am^(-1)`?

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