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 "negative."What are one of the main uses of this device ?

A cathode ray tube produces a beam of charged particles, usually electrons, that can be studied as it travels through the tube. Therefore, one of its main uses is to examine a beam of charged particles. It does not magnetize atoms or change a proton’s strength.

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