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[" A toroidal solenoid has "3000],[" tur...

[" A toroidal solenoid has "3000],[" turns and a mean radius of "],[10cm." It has a soft iron core "],[" of relative permeability "2000" ."],[" Find the magnetic field in the "],[" core when a current of "1.0A],[" is passed through the "],[" solenoid.(in units of T) "]

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