An electromagnet is used to support a solid piece of steel, as shown in Example 13.9. A force of 10,000 N is required to support the weight. The cross-sectional area of the magnetic core (the fixed part) is 0.01 m2. The coil has 1,000 turns. Determine the minimum current that can keep the weight from falling for x = 1.0 mm. Assume negligible reluctance for the steel parts and negligible fringing in the air gaps.
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