A wire of radius 0.5 cm carries a current of 100 A that is uniformly distributed over

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A wire of radius 0.5 cm carries a current of 100 A that is uniformly distributed over its cross-sectional area. Find B

(a) 0.1 cm from the center of the wire,

(b) At the surface of the wire, and

(c) At a point outside the wire 0.2 cm from the surface of the wire.

(d) Sketch a graph of B versus the distance from the center of the wire.

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