When cathode rays are deflected onto the electrode of an electrometer, the instrument becomes
When cathode rays are deflected onto the electrode of an electrometer, the instrument becomes negatively charged. Cathode rays are streams of fast-moving electrons that are negatively charged. When they are deflected towards a positive electrode, it demonstrates that they are negatively charged. This is because opposite charges attract each other.
There is an explanation video available below.
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