An electromagnet in the shape of a horseshoe has a coil with N turns. The coil carries a current I. The cross section of the horseshoe is A. Suppose that you are holding the electromagnet on top of a small bar laying flat on a desk. The bar is made of the same material as the electromagnet core. The field between one of the horseshop poles and the bar is
An electromagnet in the shape of a horseshoe has a coil with N turns. The coil carries a current I. The cross section of the horseshoe is A. Suppose that you are holding the electromagnet on top of a small bar laying flat on a desk. The bar is made of the same material as the electromagnet core. The field between one of the horseshop poles and the bar is
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