Mathematical and Physical Journal
for High Schools
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Problem P. 4050. (February 2008)

P. 4050. One of the sides of the frame shown in the figure can move. The frame is in uniform magnetic field of \boldsymbol{B}, which is perpendicular to the plane of the frame. At the time of t=0 the magnetic field begins to decrease as B(t)=\frac{B_{0}}{1+kt}.

With what speed should the side of the frame be moved in order not to induce electric current in it?

(4 pont)

Deadline expired on March 11, 2008.


Statistics:

56 students sent a solution.
4 points:Balogh Gábor, Bartha 002 Zsolt, Berta Katalin, Boros Csanád Örs, Csató Bertalan, Csengeri Béla, Deák Zsolt, Deli Gábor, Filep Tibor, Fodor Tibor, Fonyó Dávid, Földes Imre, Gál Bálint, Harsányi Szabolcs, Hartstein Máté, Hegyi Ádám, Hofecker Andor, Iván Dávid, Kalina Kende, Kovács 235 Gábor, Kovács 888 Gábor, Kovács 915 István, Kovács Benjámin, Krämer Zsolt, Kupcsik Réka, Lovas Lia Izabella, Matolcsi Csaba, Pázmán Koppány, Piller Éva, Rácz Viktor, Rárósi Dávid, Sándor Bulcsú, Sós Attila Róbert, Szabó 313 Gábor, Szabó 895 Dávid, Szikszay László, Szolnoki Lénárd, Tolnai Gábor, Tóth 123 László, Török 125 Csaba, Varga 777 Ádám, Veres 001 Máté, Vőfély Róza Villő.
3 points:Farkas Márton, Ferenczy László, Papp Ádám, Schlarb Krisztián.
2 points:7 students.
1 point:2 students.

Problems in Physics of KöMaL, February 2008