Mathematical and Physical Journal
for High Schools
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# Problem P. 4656. (September 2014)

P. 4656. Three threads of equal length are hung at the same point and at the other end of each thread there is a small sphere, each having the same mass. The same charge is given to each of them. What is the radius of the circle at which the spheres are at rest?

Data: $\displaystyle \ell=20$ cm, $\displaystyle m=1.3~$grams, $\displaystyle Q=1.2\cdot10^{-7}$ C.

(5 pont)

Deadline expired on October 10, 2014.

### Statistics:

 92 students sent a solution. 5 points: 52 students. 4 points: 21 students. 3 points: 15 students. 2 points: 3 students. 0 point: 1 student.

Problems in Physics of KöMaL, September 2014