Question

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.

Answer 1

(a) r = 10cm = 10 × 10^–2m

x = 2 × 10^–2m, i = 5A

i in the region of radius 2cm

(b) 10cm radius