Mathematical and Physical Journal
for High Schools
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Problem P. 3970. (March 2007)

P. 3970. An electron is shot into uniform magnetic field of magnitude B=10-3 T the width of which is d=2 cm. The velocity of the electron is perpendicular to the magnetic field lines, the angle between the velocity of the electron and the normal of the boundary is \alpha=30o.

a) What is the least velocity of the electron if it goes through the region of magnetic field of width d?

b) What is the speed below which the electron cannot go through the magnetic field of width d?

(5 pont)

Deadline expired on April 11, 2007.

Statistics:

68 students sent a solution.
5 points:Almási 270 Gábor András, Balambér Dávid, Balogh Máté, Bogár 560 Péter, Drozdy András, Dudás János, Földes Imre, Földes Tamás, Hartstein Máté, Lovas Lia Izabella, Nagy Zsolt Péter, Pálovics Róbert, Szilágyi Zsombor, Szolnoki Lénárd, Takács 484 Marcell, Tóth 113 Zsolt, Tűri Balázs, Tüzes Dániel, Varga Bonbien.
4 points:Almasi Susann Melinda, Berta Katalin, Csányi Gergely, Demeter Dániel, Egyed Lenke, Egyed Zsombor, Farkas Ádám László, Hegyi Ádám, Horváth 795 Andrea, Horváth Bence, Lénárt Tamás, Lovas Attila, Nagy 224 Csaba, Pásztor Árpád, Rárósi Dávid, Roósz Gergő, Tolner Ferenc, Túri Attila, Vécsei Miklós, Vőfély Róza.
3 points:15 students.
2 points:5 students.
0 point:1 student.
Unfair, not evaluated:8 solutionss.

Problems in Physics of KöMaL, March 2007