The relation between permeability (u) and reluctance (S) is given by:

(Where I is the mean length of magnetic circuit for flux, and a is the area of cross section available for flux.)

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Question

This question was previously asked in

MPPGCL JE Electrical 19 March 2019 Shift 2 Official Paper

Answer 1

Terms used in Magnetic Circuit

The relation between permeability and reluctance is given by:

\(S=\frac{l}{μ a}\)

where, S = Reluctance

μ = Permeability

l = Mean length of magnetic circuit

a = Area of cross section

Also, the reluctance in a magnetic circuit is given by:

\(S={MMF\over \phi}\)

where, MMF = N × i

N = No. of turns

i = Current