What is the current in a wire of radius R = 3.40 mm if the magnitude of the current density is given by (a) J a = J r/R and (b) J b = J (1 - r/R), in...

What is the current in a wire of radius R =3.40 mm if the magnitude of the currentdensity is given by (a) J a = J r/R and(b) J b = J (1 - r/R), in which r is the radialdistance and J =5.50104 A/m2 ? (c) Whichfunction maximizes the current density near thewire's surface?