Mathematical and Physical Journal
for High Schools
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Problem P. 4019. (November 2007)

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 pont)

Deadline expired on December 11, 2007.


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 solutions.

Problems in Physics of KöMaL, November 2007