A uniform surface current density of Js(r ? )=Jo(sin??) ? ? A/m [the r is a vector and the phi is a unit vector for some reason the hat and error are not directly over the letter] (Jo is constant) is spread over a disk defined by 0???b ,0???2pi ,z=0 Note: Js is a vector, R is a vector also a. What is the source position vector r' needed to locate the current so one can find the magnetic field intensity H at z=h b. What is the differential surface element needed so one can find the magnetic field intensity H at z=h c. What is the expression for Js x R needed so one can find the magnetic field intensity H at z=h d. What is the expression for the magnetic field intensity H at z = h