A flux of 9.0 10 -4 Wb is produced in the iron core of a solenoid.
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A flux of 9.0 × 10-4 Wb is produced in the iron core of a solenoid. When the core is removed, a flux (in air) of 5.0 × 10-7 Wb is produced in the same solenoid by the same current. What is the relative permeability of the iron?
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