1. In the case of a solenoid, the magnitude of the magnetic field is proportional to what?

2. In Figure 1, the geometric objects that appear placed on top of each other with an axis or rod that passes through them are permanent magnets. The letter "S" identifies the magnetic pole on the upper face of the second magnet counting from bottom to top. Figure 2 shows the same arrangement seen from the side. Identify the rest of the polarities of the magnet faces from the polarity already identified. Write N or S above the arrow pointing to the pole.

S Fig.1