For an inductor made from magnetic core, with two air gaps of equal length g, exciting coil with 1000 turns, A=5cm∗5cm and g=1cm, what will be the coil inductance?(a) 0.314H(b) 0.157H(c) 0.078H(d) 0.628HThe question was posed to me during an internship interview.I want to ask this question from Torque Production and Dynamic Equations in section Basic Concepts in Rotating Machines of Electrical Machines

For an inductor made from magnetic core, with two air gaps of equal le

1.	For an inductor made from magnetic core, with two air gaps of equal length g, exciting coil with 1000 turns, A=5cm∗5cm and g=1cm, what will be the coil inductance?(a) 0.314H(b) 0.157H(c) 0.078H(d) 0.628HThe question was posed to me during an internship interview.I want to ask this question from Torque Production and Dynamic Equations in section Basic Concepts in Rotating Machines of Electrical Machines
Answer» Right choice is (b) 0.157H Easy EXPLANATION: Reluctance Rl=2g/μ0A and COIL Inductance L=N^2/Rl = N^2μ0A/2g = (1000)^2(4π∗10^-7)(0.05)^2/(2∗0.01) = 0.15708H.

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