According to Ampère’s law, the magnetic field produced by a long, straight wire depends...

According to Ampère’s law, the magnetic field produced by a long, straight wire depends only on the current enclosed by the Ampère’s law path (Eq. 20.16). Use this fact to compute the magnetic field inside a wire (Fig. P20.78). Assume the wire has a radius R = 1.0 mm and carries a current I = 2.5 A. (a) Find the field a distance R/2 from the axis of the wire. (b) What is the ratio of the field in part (a) to the field at the surface of the wire?