Help me please

' A very long coaxial cable consists of an inner solid cylinder of - radius 3.5a and an outer shell of radius 4.5'a, where a - 1.29 cm, as oictured. I? 2 The inner conductor carries a current I, _ -3.57 A with uniform current density and the outer conductor carries a total current I = 2.49 A that is uniformly distributed over the circumference (positive currents are out of the screen and negative currents are into the screen). a. Find the magnitude of magnetic field a distance 2a from the center of the inner conductor. Enter unit in term of MT B. Find the magnitude of magnetic field a distance 3a from the center of the inner conductor. C. Find the magnitude of magnetic field a distance 5a from the center of the inner conductor