1.5: Exercises (3) (7) A U-shaped electromagnet having three (3) airgaps has a core of effective length 750 mm and a cro

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1 5 Exercises 3 7 A U Shaped Electromagnet Having Three 3 Airgaps Has A Core Of Effective Length 750 Mm And A Cro 1 (38.31 KiB) Viewed 72 times

1.5: Exercises (3) (7) A U-shaped electromagnet having three (3) airgaps has a core of effective length 750 mm and a cross-sectional area of 650 mm2. A rectangular block of steel of mass 6.5 kg is attracted by the electromagnet's force of alignment when its 500-turn coils are energized. The magnetic circuit is 250 mm long and the effective cross-sectional area is also 650 mm2. If the relative permeability of both core and steel block is 780, estimate the coil urent. Neglect frictional losses and assume the acceleration due to gravity as • [Hint: There are 3 airgaps, and so the force equation must be multiplied by 3]