A thin metallic cylinder of radius R and thickness d, such that d R is moving with velocity v along a concentric wire which carries a current I (see...

A thin metallic cylinder of radius R and thickness d, such that d R is moving with velocity v along a concentric wire which carries a current I (see figure) 1. What is the magnetic filed produces by the current at the distance R from the wire? 2. What is the potential difference between the inner and outer surfaces of the cylinder?