Mathematical and Physical Journal
for High Schools
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Problem P. 4569. (October 2013)

P. 4569. A hollow insulating sphere of radius R is charged uniformly to a charge of Q. There is a small hole on this sphere. What is the electric field strength at the centre of this hole?

(5 pont)

Deadline expired on November 11, 2013.

Sorry, the solution is available only in Hungarian. Google translation

Megoldásvázlat. Éppen fele, mint a gömb többi részének közelében: \(\displaystyle E_\text{lyuk}=\frac{1}{8\pi\varepsilon_0}\frac{Q}{R^2}.\)


32 students sent a solution.
5 points:Antalicz Balázs, Bugár 123 Dávid, Csathó Botond, Fehér Zsombor, Holczer András, Horicsányi Attila, Jakovác Kristóf, Janzer Barnabás, Juhász Péter, Olosz Balázs, Sal Kristóf.
3 points:4 students.
1 point:5 students.
0 point:9 students.
Unfair, not evaluated:3 solutionss.

Problems in Physics of KöMaL, October 2013