KöMaL - Mathematical and Physical Journal for Secondary Schools
Hungarian version Information Contest Journal Articles News
Entry form to the contest
Problems and solutions
Results of the competition
Problems of the previous years



Order KöMaL!

Competitions Portal

P. 4019. A parallel plate condenser of charge Q consists of two vertical square-shaped plates of sides a, which are at a distance of d. Between the plates, parallel to them, there is another square-shaped metal plate which has the same size as the plates of the condenser and its width is d/3. Find the work done while this plate of density \varrho is pulled out of the plates.

(5 points)

Deadline expired on 11 December 2007.

Statistics on problem P. 4019.
73 students sent a solution.
5 points:53 students.
4 points:8 students.
3 points:3 students.
2 points:4 students.
1 point:4 students.
Unfair, not evaluated:1 solution.

  • Problems in Physics of KöMaL, November 2007

  • Our web pages are supported by:   Ericsson   Google   Cognex   Emberi ErőforrĂĄs TĂĄmogatĂĄskezelő   Emberi ErőforrĂĄsok MinisztĂŠriuma  
    OktatĂĄskutatĂł ĂŠs Fejlesztő IntĂŠzet   Nemzeti TehetsĂŠg Program     Nemzeti
KulturĂĄlis Alap   ELTE   Morgan Stanley