# Magnetic field of a hollow cylinder#

The figure shows a cross-section of a long, hollow, cylindrical conductor of inner radius $$r_1 = {{ params.r1 }}\rm\ cm$$ and outer radius $$r_2 = {{ params.r2 }}\rm\ cm$$. A $${{ params.I }}\rm\ A$$ current distrubted uniformly over the cross-section flows into the screen.

## Part 1#

Calculate the magnitude of the magnetic field at a radius $$r = {{ params.ra }}\rm\ cm$$ measured from the axis of the hollow cylinder.

## Part 2#

Calculate the magnitude of the magnetic field at a radius $$r = {{ params.rb }}\rm\ cm$$ measured from the axis of the hollow cylinder.

Calculate the magnitude of the magnetic field at a radius $$r = {{ params.rc }}\rm\ cm$$ measured from the axis of the hollow cylinder.