When cathode rays are deflected onto the electrode of an electrometer, the instrument becomes
Answer Details
When cathode rays, which are negatively charged, are deflected onto the electrode of an electrometer, the instrument becomes negatively charged. This is because the cathode rays are negatively charged, and when they come into contact with the electrode of the electrometer, they transfer some of their negative charge to the electrode, causing it to become negatively charged as well. As a result, the deflection of cathode rays towards the electrode of the electrometer can be measured and detected.