Question

# A thin iron ring with mean diameter supports a winding consisting of turns carrying current . The ring has a cross-cut of width . Neglecting the scattering of the magnetic flux at the gap edges, and using the plot shown in Fig., find the permeability of iron under these conditions.

Hard
Updated on : 2022-09-05
Solution
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Correct option is A)

## From the theorem on circulation of vector , or, , Where is in Tesla and in . Besides, and are interrelated as in the figure shown below of the text. Thus we have to solve for , graphically by simultaneously drawing the two curves (the hysterisis curve and the straight line, given above) and find the point of intersection. It is at, Then .

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