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The magnetic field inside a long solenoi...

The magnetic field inside a long solenoid having 50 turns `cm^(-1)` is increased from `2.5 xx 10^(-3) T` to `2.5 T` when an iron core of cross-sectional area `4 cm^2` is inserted into it. Find `(a) the current in the solenoid, (b) the magnetization `I` of the core and (c) the pole strength developed in the core.

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