Question

Reluctance of a coil is given by which of the following relation?

(a) S = ^1⁄A

(b) S = ^1⁄μ

(c) S = ^a⁄μA

(d) S = ^1⁄μA

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Answer 1

Correct answer is (d) S = ^1⁄μA

Explanation: The reluctance of an inductance coil is given by the relation

S = ^1⁄μA

where, l is the length of the magnetic circuit (m)

            a is the area of the magnetic circuit which encloses the flux (m^2)

            µ is the permeability of the core (H/m).