If the velocity of electron increases, its specific charge

If the velocity of electron increases, its specific charge

  1. A

    increases

  2. B

     decreases

  3. C

    remains constant

  4. D

    may increase or decrease

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    Solution:

    Mass of electron=rest mass of electron1V2C2
    V = Velocity of electron 
    C = Velocity of light
    As velocity of electron increases,V2C2   increases and 1V2C2  decreases as denominator decreases mass of electron increases (rest mass electron is a constant) and thus  e/m (specific charge) decreases
     

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