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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 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

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