A coil of wire 0.5 m long and having 20 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 20.29, 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 1.0 A?