Compute the flux density in an iron core.

A magnetic circuit consists of an iron core of a cross sectional area of 4cm^2 in which an air gap is cut in, where a flux density of 0.9T is required. There is a leakage factor of 1.2 and fringing increases the cross sectional area of the gap by 10%.

What should be the flux density in the iron?

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...2, that means you have to include the flux leakage in the air-gap. When the leakage happened, the flux that went through the air-gap is smaller than the flux in the core. In this problem, the flux in the core is ...