An electric current is uniformly distributed throughout a long, straight wire that has a diameter of \(50 \mathrm{~mm}\). If the current through the wire is \(6.0 \mathrm{~A}\), calculate the magnitude of the magnetic field (a) \(20 \mathrm{~mm}\) radially away from the wire center and \((b) 50 \mathrm{~mm}\) radially away from the wire center. (c) What must the current be to create a magnetic field of magnitude \(1.0 \mathrm{~T} 50 \mathrm{~mm}\) radially away from the wire center?