Assertion :Cathode rays are deflected towards positive plate in an electric field. Reason: These consist of negatively charged particles.
A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Assertion is incorrect but Reason is correct
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Solution
The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion Cathode rays consist of negatively charged particles. When cathode rays are subjected to an electrical field, these get deflected towards the positively charge plate i.e. Anode. We know that a positively charged body would attract only a negatively charged body, therefore the particles of cathode rays carry negative charge.
Cathode rays also get deflected when these are subjected to a strong magnetic field. The electrons in the cathode rays would deflect toward the positively charged plates, and away from the negatively charged plates.