Two identical toroid inductors are connected in series. One was wound 400 times with a cross-sectional area of 4 sq.mm and coupling coefficient of 0.87. What is the total inductance if the mean radius of the other inductor is 1.8 cm and both inductors aided each other?

Delmar's Standard Textbook Of Electricity
7th Edition
ISBN:9781337900348
Author:Stephen L. Herman
Publisher:Stephen L. Herman
Chapter25: Surge, Spike, And Lightning Protection
Section: Chapter Questions
Problem 10RQ: In reference to the load, how are capacitors connected to help prevent voltage spikes and surges?...
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Two identical toroid inductors are connected in series. One was wound 400 times with a cross-sectional area of 4 sq.mm and coupling coefficient of 0.87. What is the total inductance if the mean radius of the other inductor is 1.8 cm and both inductors aided each other?

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