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When cathode rays are deflected onto the electrode of an electrometer…

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When cathode rays are deflected onto the electrode of an electrometer, the instrument becomes?

A. Bipolar

B. Negatively charged

C. Positively charged

D. Neutral




Here, it is assumed that the instrument was initially neutral; when cathode rays, which are negatively charged particles are deflected unto its electrode, the instrument will become negatively charged. This is because it gained extra negatively charged electrons.

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Now for the right answer to the above question:

  1. Option A is incorrect. not bipolar.
  2. Option B is correct. negatively charged because cathode rays are negatively charged electrons.
  3. C is incorrect. not positively charged.
  4. D is not the correct answer. not neutral.


You may please note these/this:

  • Cathode rays are in fact electrons.
  • They are negatively charged.
  • When deflected towards an instrument, it renders the instrument negative in charge.
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/ culled from 2020 JAMB-UTME chemistry past question 35 /

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