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Electromechanical device dynamic equation

xmin = 0.15 𝑐𝑚, xmax = 2.2 cm, 𝑔1 = 1 mm, ℎ1 = 3 cm, R=7cm. I need to find the reluctances of the equivalent magnetic circuit. I know the formula;

r = l/µ*A

but I don’t know how to find the area. can you help me with that?

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