Mathematical and Physical Journal
for High Schools
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Problem P. 4219. (January 2010)

P. 4219. The piece of rigid wire, shown in the figure, and which can freely turn about the vertical axis of PQ, is placed into uniform horizontal magnetic field. B=0.05 T, r=0.05 m, \ell=0.3 m. A current of I=10 A flows in the wire and the mass of one metre-long wire is 10 dkg. What is the period of this piece of wire when it is oscillating with small amplitude?

(5 pont)

Deadline expired on February 10, 2010.

Sorry, the solution is available only in Hungarian. Google translation

Megoldás. \(\displaystyle T=0,66\) s.


38 students sent a solution.
5 points:Benyó Krisztián, Börcsök Bence, Galzó Ákos Ferenc, Janosov Milán, Kaposvári István, Kungl Ákos Ferenc, Laczkó Zoltán Balázs, Mayer Martin János, Pálovics Péter, Szabó 928 Attila, Szegedi Domonkos.
4 points:Batki Bálint, Budai Ádám, Filep Gábor, Jéhn Zoltán, Kószó Simon, Lájer Márton, Patartics Bálint, Varju 105 Tamás, Várnai Péter.
3 points:14 students.
2 points:2 students.
1 point:1 student.
0 point:1 student.

Problems in Physics of KöMaL, January 2010