Question

a cathode ray tube is made of glass with a small amount of some kind of gas in it. it has metal electrodes at each end to pick up an electric current. the electrodes are named \positive\ and
egative.\ what are one of the main uses of this device ? to speed up the flow of current flowing through a wire to examine a beam of charged particles to magnetize different atoms within a space to change the strength of a proton within an atom

Explanation:

Cathode - ray tubes are used to study charged - particle beams. They create and manipulate electron beams (charged particles). The other options are not functions of cathode - ray tubes.

Answer:

to examine a beam of charged particles