Problem 3.238

A thin conducting strip of width \(h=2.0 \mathrm{~cm}\) is tightly wound in the shape of a very long coil with cross-section radius \(R=\) \(=2.5 \mathrm{~cm}\) to make a single-layer straight solenoid. A direct current \(I=5.0\) A flows through the strip. Find the magnetic induction inside and outside the solenoid as a function of the distance \(r\) from its axis.