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Question

Which of the following is not correct?


A

Cathode rays travel in straight line

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B

Cathode rays are made up of material particles.

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C

Cathode rays consists of positively charged particles

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D

None of these

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Solution

The correct option is C

Cathode rays consists of positively charged particles


If we look at the videos, we can see that

When electrical field is applied to the cathode rays with the help of a pair of metal plates, they are found to be deflected towards the positive plate, indicating the presence of negative charge.

Similarly, when a magnetic field is applied, these are deflected in a direction, which shows that they carry negative charge. R.A. Millikan (1917) by its oil drop experiment established that electron has charge 1.60 × 1019 C.

The characteristics of cathode rays are:

(i) Cathode rays travel in straight line : When a solid object is placed in the path of the cathode rays, its shadow is noticed immediately behind it. This shows that the cathode rays travel in straight line.

(ii) Cathode rays are made up of material particles : If a light paddle wheel made from mica is mounted on an axis, is placed in the path of the cathode rays, it starts rotating. This shows that cathode rays consists of material particles.

(iii) Cathode rays consist of negatively charged particles : When electrical field is applied to the cathode rays with the help of a pair of metal plates, they are found to be deflected towards the positive plate, indicating the presence of negative charge.


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