KöMaL - Középiskolai Matematikai és Fizikai Lapok
Sign In
Sign Up
 Magyar
Information
Contest
Journal
Articles

 

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:

93 students sent a solution.
5 points:52 students.
4 points:21 students.
3 points:15 students.
2 points:3 students.
0 point:1 student.
Unfair, not evaluated:1 solution.

Our web pages are supported by:   Ericsson   Cognex   Emberi Erőforrás Támogatáskezelő   Emberi Erőforrások Minisztériuma   Nemzeti Tehetség Program    
MTA Energiatudományi Kutatóközpont   MTA Wigner Fizikai Kutatóközpont     Nemzeti
Kulturális Alap   ELTE   Morgan Stanley