Mathematical and Physical Journal
for High Schools
Issued by the MATFUND Foundation
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Problem P. 3980. (April 2007)

P. 3980. A pair of wire is used to transfer power of 100 kW to a distance of 100 km, such that the decrease in the voltage can be maximum 2%. The wire is made of copper the resistivity of which is 1.7.10-8 \Omegam, the diameter of the wire is 20 mm. Calculate the voltage.

(4 pont)

Deadline expired on May 11, 2007.


Statistics:

93 students sent a solution.
4 points:Almasi Susann Melinda, Berta Katalin, Bodosi Eszter, Borbély Adrienn, Bőle Pál, Csige Péter, Deák Zsolt, Derda Máté, Domsa Daniella, Dudás János, Fehér András, Fekete 925 István, Fodor Tibor, Fonyó Dávid, Hegyi Ádám, Hohmann Balázs, Kovács 888 Gábor, Lénárt Gábor, Lénárt Tamás, Pálovics Péter, Pálovics Róbert, Para Attila, Rárósi Dávid, Réti Dávid, Roósz Gergő, Somogyi József, Spohn Márton, Szabó 666 Dániel, Szekér Péter, Szilágyi Zsombor, Takács 484 Marcell, Tolnai Gábor, Tóth 113 Zsolt, Tóth 123 László, Tűri Balázs, Vécsei Miklós, Vécsi Áron, Vida György.
3 points:14 students.
2 points:11 students.
1 point:19 students.
0 point:3 students.
Unfair, not evaluated:8 solutionss.

Problems in Physics of KöMaL, April 2007