A NONCONDUCTING sphere with uniform volume charge density ? HELP!! 1. The problem statement, all variables and given/known data so this is the problem, a nonconducting sphere of radius [itex]\alpha[/itex] has a uniform volume charge density with total charge Q. the sphere rotates about an axis through its center with constant angular velocity [itex]\varpi[/itex] . Find the magnetic field at the center of the sphere. ALSO, how is a non conducting sphere able to have charge density ?