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, =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 points)

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Sorry, the solution is published in Hungarian only.

T=0,66 s.

Statistics on problem P. 4219. 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.