The current density in a cylindrical wire of radius R = 2.0 mm is uniform across a cross section of the wire and is J = 2.0*105 A/m2. What is the current through the outer portion of the wire between the radial distances R/2 and R?Suppose, instead, that the current density through a cross section varies with the radial distances r as J = ar2 in which a = 3.0*1011 A/m2 and r is in meters. What now is the current through the same outer portion of the wire?

Yashraj singh rajawat , 7 Years ago

Grade 12