Multiple choice general knowledge science & technology

What is the unit of ration e/m for electron

  1. C/g

  2. C/Kg

  3. Dimensionless

  4. C/Pound
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The charge-to-mass ratio (e/m) of an electron has units of coulombs per kilogram (C/kg) since it is obtained by dividing the charge in coulombs by the mass in kilograms. J.J. Thomson measured this ratio to be approximately 1.76 × 10^11 C/kg. This specific ratio helped identify the electron as a fundamental particle. Option B correctly represents the unit as C/kg. Options A and D are incorrect units, while e/m is not dimensionless.

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