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Question

The mass of the electron varies with

A
The variation of $$'g'$$
B
Velocity
C
The size of the cathode ray tube
D
Size of the electron
Solution
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Correct option is C. Velocity
Mass is basically a constant term for any physical application at low velocity. But in accordance with Einstein's theory of relativity, at higher speeds the mass of the particle change according to formula

$$m=\dfrac{m}{\sqrt{1-(v^2/c^2)}}$$

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