A coil carrying a current i with length land radius has a nonuniform turn density such that the magnetic field inside is described by b B = x+1 -where x is the distance from the center of the coil along its axis and b is a constant. Which expression gives the energy stored in the magnetic field inside the coil? C πι U = = = = но πr² 62 но πr² b² но Tr² 62 но 1+ 1+2 b² но 1+2

A coil carrying a current i with length land radius has a nonuniform turn density such that the magnetic field inside is described by b B = x+1 -where x is the distance from the center of the coil along its axis and b is a constant. Which expression gives the energy stored in the magnetic field inside the coil? C πι U = = = = но πr² 62 но πr² b² но Tr² 62 но 1+ 1+2 b² но 1+2