Question: A long, iron-core solenoid with 2000 turns/m carries a current of 20 mA. At this current, the relative permeability of the iron core is 1200.

A long, iron-core solenoid with 2000 turns/m carries a current of 20 mA. At this current, the relative permeability of the iron core is 1200.

(a) What is the magnetic field within the solenoid?

(b) With the iron core removed, what current will produce the same field within the solenoid?

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