Simulation Used: https://virtuelle-experimente.de/en/b-feld/b-feld/experiment.php

https://www.youtube.com/watch?v=jcgWlD9PteM&ab_channel=JohnKielkopf

A particle's dynamics are considered "relativistic" when its velocity is a significant fraction of the speed of light. For example, the mass of a moving particle seen by a stationary observer increases in proportion to the square root of 1/(1 - (v/c)²). For typical speeds in the everyday world it is not noticeable, but take a fast moving fundamental particle and you may have apparent mass increases or changes in its lifetime as a consequence of time dilation.

Look at this factor for the electron you measured at 100 V in the glass globe. Pick the best answer.

A. The effect is less than 0.1%

B. The effect is around 1%

C. The effect is around 10%

D. The effect is a factor of 2 change in mass