A-level Physics (Advancing Physics)/Flux/Worked Solutions

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1. A circular steel core has a cross-sectional area of 9 cm2, and a length of 0.5m. If the permeability of steel is 875 μNA−2., what is the permeance of the core?

2. A coil of insulated wire is wrapped 60 times around the top of the core, and a 9A direct current is put through the coil. How much flux is induced?

3. Assuming that all the flux goes through the core, what is the flux density at any point in the core?

4. Draw a diagram showing the lines of flux within the core.

Flux circular core.svg