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Question 2.36: Assume that the reluctance of the gap is equal to the reluct...

Assume that the reluctance of the gap is equal to the reluctance of the iron in Figure 2-40.     The iron has a relative permeability of \mu_{r} = 1000. Determine the length of the gap in terms of the length of the iron.

2.40
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The reluctance of the two regions is defined as R_{\text {iron }}=\frac{L}{A \mu_{o} \mu_{r}} and R_{\text {gap }}=\frac{ g }{ A \mu_{ o }} .  The length of the gap g is found to be  g=\frac{L}{\mu_{r}}=\frac{L}{1000} .

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