Static current is an imbalance of electric charges within or on the surface of a material,however electric current is electric charge on motion.
Omitting the 1 will not change the value of the number, but will change the units at the end of the problem
B. Bombarded by high speed electrons.
There are already electrons with potential energy in the conductor. When it is bombarded by these high speed electrons, the potential energy is changed into kinetic energy and then the electrons are emitted from the conductor.
Hope this helps.
Flat model, conic projection