Check my answer to a very similar question two days ago.
http://www.jiskha.com/display.cgi?id=1318589983
The numbers are different but the formula to use is the same.
Two balls have the same mass of 0.525 kg and identical charges of 13.0 μC. They hang from the ceiling on strings of identical length as shown in the figure. If the angle with respect to the vertical of the strings is 22.0°, what is the length of the strings?
1 answer
1 answer