An electromagnet is made by inserting a soft iron core into a solenoid. The solenoid has 1800 turns, radius 2.00 cm, and length 16.6 cm. When 2.00 A of current flows through the solenoid, the magnetic field inside the iron core has magnitude 0.620 T. What is the relative permeability KB of the iron core?

An electromagnet is made by inserting a soft iron core into a solenoid. The solenoid has 1800 turns, radius 2.00 cm, and length 16.6 cm. When 2.00 A of current flows through the solenoid, the magnetic field inside the iron core has magnitude 0.620 T. What is the relative permeability KB of the iron core?

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