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A solenoid is made of 400 turns of wire on a 20-cm iron core. The relative permeability of iron is 13000. What current is required

A solenoid is made of 400 turns of wire on a 20-cm iron core. The relative permeability of iron is 13000. What current is required to produce a 0.5 T magnetic induction at the center of the solenoid?

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