<Dd> A is the cross-sectional area of the circuit in square metres </Dd> <P> The inverse of reluctance is called permeance . </P> <Dl> <Dd> P = 1 R (\ displaystyle (\ mathcal (P)) = (\ frac (1) (\ mathcal (R)))) </Dd> </Dl> <Dd> P = 1 R (\ displaystyle (\ mathcal (P)) = (\ frac (1) (\ mathcal (R)))) </Dd>

R e l u c t a n c e