Saved Bookmarks
| 1. |
A soap bubble (surface tension`=T`) is charged to maximum surface density of charge`= sigma`. When it is just going to burst. Its radius `R` is given by:A. `R=(sigma^(2))/(8epsilon_(0)T)`B. `R=8epsilon_(0)T/(sigma^(2))`C. `R=(sigma)/(sqrt(8(epsilon_(0)T))`D. `R=(sqrt(8epsilon_(0)T))/(sigma)` |
|
Answer» Correct Answer - B The pressure due to surface tension `=(4T)/R` The pressure due to electrostatic forces `=(sigma^(2))/(2epsilon_(0))` Just before the bubble bursts `(4T)/R=(sigma^(2))/(2epsilon_(0))` or `R=(8Tepsilon_(0))/(sigma^(2))` |
|