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

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

A. negatively charged

B. positively charged

C. neutral

D. bipolar




In order to correctly answer this question, we need to understand clearly what an electrometer is.

An electrometer is an instrument designed to measure either charges, or the potential difference created by charges. For instance, a gold leaf electroscope is an example of an electrometer, it actually measures charges.

Now, cathode rays are negatively charged streams of particles called electrons, when they are deflected into an electrometer, they transmit their negative charges to the device, making it negatively charged.

Now for the right answer to the above question:

  1. Option A is correct. The negativity of the rays is simply transferred.
  2. Option B is incorrect. additional negatively charged particles, and not positively charged particles, are added into the instrument.
  3. C is incorrect. the electrometer was initially neutral before streams of negatively charged electrons were introduced, this leaves it with no neutrality. Even if it were initially positively charged, these positive charges are more likely to be overwhelmed by the streams of negative charges.
  4. D is not the correct answer.
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You may please note these/this:

  • An electrometer is an instrument used to measure charges or the potential difference created by charges.
  • When beams of cathode rays get deflected into them, they end up measuring the charges and acquiring the negative charges.

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/ culled from 2017 JAMB-UTME Chemistry question 10 /

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