Reluctance of a magnetic circuit is given by:

1
\(\frac{{{\mu _0}{\mu _r}A}}{l}\)
2
\(\frac{A}{{{\mu _0}{\mu _r}l}}\)
3
\(\frac{{{l^2}}}{{{\mu _0}{\mu _r}A}}\)
4
\(\frac{l}{{{\mu _0}{\mu _r}A}}\)

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