Mathematical and Physical Journal
for High Schools
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Problem P. 3988. (May 2007)

P. 3988. A small charged bead of mass m and of charge q can move on a frictionless horizontal rod. A pointlike charge Q whose charge is opposite the charge on the bead, is fixed at a point which is at a distance of d from the rod. The bead is a bit displaced from its equilibrium position and then released. Find the period of the resulted oscillatory motion.

Data: Q=10-8 C, q=-10-8 C, m=1 g, d=10 cm.

(5 pont)

Deadline expired on June 11, 2007.


Statistics:

46 students sent a solution.
5 points:Almási 270 Gábor András, Almasi Susann Melinda, Balogh Máté, Blázsik Zoltán, Csányi Gergely, Csató Bertalan, Demeter Dániel, Drozdy András, Dudás János, Egyed Lenke, Farkas Ádám László, Hegyi Ádám, Hlatky Dávid, Kómár Anna, Lovas Lia Izabella, Nagy 224 Csaba, Pálovics Róbert, Pásztor Ádám Viktor, Pásztor Árpád, Pázmán Koppány, Rárósi Dávid, Sándor Bulcsú, Soós 989 János, Szabó 001 Áron, Szilágyi Zsombor, Szolnoki Lénárd, Takács 484 Marcell, Tolnai Gábor, Túri Attila, Tüzes Dániel, Varga Bonbien, Vécsi Áron, Vida György.
4 points:Tűri Balázs.
3 points:1 student.
2 points:4 students.
1 point:4 students.
Unfair, not evaluated:3 solutions.

Problems in Physics of KöMaL, May 2007