Mathematical and Physical Journal
for High Schools
Issued by the MATFUND Foundation

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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.

Statistics:

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

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.