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A solid wire of radius 10cm carries a current of 5.0A distributed uniformly over its cross-section. Find the magnetic field B at a point at a distance (a) 2cm (b) 10cm and (c) 20cm away from the axis. Sketch a graph of B versus x for 0 < x < 20cm.

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(a) r = 10cm = 10 × 10–2m

x = 2 × 10–2m, i = 5A

i in the region of radius 2cm

(b) 10cm radius

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