Question

Assume that we have an air-core toroid with 500 turns, a cross-sectional area of 6 cm2, a mean radius of 15 cm, and a coil current of 4 A. As we already know, the magnetic field is confined to the interior of the toroid, and if we consider the closed path of our magnetic circuit along the mean radius. Find:

1. a) the mmf in the core

2. b) the core reluctance

3. c) the magnetic flux

4. d) the B-field

5. e) the H-field

Answer 1

Ans)

a) Given

MMF in the core is

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b) length of closed path is obtained  from mean radius i.e

Area of cross section is

Now core reluctance is

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c)

Magnetic flux is given as

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d)

B-field is

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e)