1. The problem statement, all variables and given/known data My cousin James asked me for help on this question and I was stumped. There is an aluminum half ring thats inside radius is 1.8cm and outer radius is 2.3 cm. It has a thickness of 4.5mm and is at 20 degrees. The left side is at 47.5 microvolts and the right end is at 0 volts. I need to calculate the current density at radius r=2cm. The total current flowing. and the total resistance between the two ends of the half ring. 2. Relevant equations mainly current density J=I/a 3. The attempt at a solution I figure you have to use the alt form of current density J= (1/p)E and then integrate over the half ring for the rest. I am unsure though and any insight would be appreciated.