EMEC

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$r_{m} = (\frac{1}{2}) \frac{O D + I D}{2}$

$l_{m} = 2 π r_{m} = 0.141$

$H_{m} = (\frac{N i}{l_{m}})$

$H_{m} = \frac{20 x 2.5}{. 141} = 354.6 A / m)$

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