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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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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 NI H=- 2z where z is the air gap space between the poles of the electromagnet and the bar. Recall that F=- VW Determine the magnitude of the force that the electromagnet exerts on the bar as a function of the gap spacing z. O a. O b. NI F= 2z OC. O d. Fedo AI 0 F = μ₁ F = μ A 0 - (NI) 2 A 1/2 (N₁) ² 4z² A 5 (NI) ² 8z²
Transcribed Image Text: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 NI H=- 2z where z is the air gap space between the poles of the electromagnet and the bar. Recall that F=- VW Determine the magnitude of the force that the electromagnet exerts on the bar as a function of the gap spacing z. O a. O b. NI F= 2z OC. O d. Fedo AI 0 F = μ₁ F = μ A 0 - (NI) 2 A 1/2 (N₁) ² 4z² A 5 (NI) ² 8z²
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