A coil of wire 0.1 m long and having 15 turns carries a current of 1.0 A.

(a) Compute the flux density if the coil is within a vacuum.

(b) A bar of an iron???silicon alloy, the B-H behavior for which is shown in Figure, is positioned within the coil. What is the flux density within this bar?

(c) Suppose that a bar of molybdenum is now situated within the coil. What current must be used to produce the same B field in the Mo as was produced in the iron???silicon alloy [part (b)] using 1.0A?

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Magnetic field strength, H (oersteds) 0.6 0.2 0.4 15,000 1.4 1.2 1.0 10,000 0.8 0.6 5,000 0.4 0.2 0.0 30 50 60 10 20 40 Magnetic field strength, H (Am) Flux density, B (tesla) Flux density, B (gau ss)