why is the electrical charge on particles in the solar wind an important element of the protection that earths magnetic field provides?

The solar wind can enter the magnetosphere at different locations and under different magnetic field conditions that we haven't know about before the magnetosphere is the planets first line of defense against the solar wind where the magnetics field is roughly parallel to the magnetic field in the solar wind

Explanation:

1/0.14nm = 10^10/1.4 a lot