The two very long solenoids below share the same axis and each carries 5.0 A of current. The smaller one has coil density 1200 coils/meter and the larger one has a coil density of 900 coils/meter. Determine the magnitude and direction of the magnetic field a distance r from the central axis of the solenoids (where r is perpendicular to the axis, and we're only concerned with points within the length of the solenoids, not at the edges or outside) when