Question
The practical limit to an electric field in air is about $3.00 \times 10^6 \textrm{ N/C}$. Above this strength, sparking takes place because air begins to ionize and charges flow, reducing the field. (a) Calculate the distance a free proton must travel in this field to reach 3.00% of the speed of light, starting from rest. (b) Is this practical in air, or must it occur in a vacuum?
1. $0.141 \textrm{ m}$
2. No, this is not practical in air since the proton would collide with many air particles while traveling this distance.
Solution Video