Mathematical and Physical Journal
for High Schools
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# Problem P. 3811. (May 2005)

P. 3811. A charged particle travels into a region in which there is a friction force proportional to the particle's velocity. It travels 10 cm from the point of entry into the region before coming to rest. If a magnetic field of unknown strength is turned on in the region, the particle comes to rest at 6 cm from the point of entry. How far from the point of entry will the particle come to rest if the magnetic field is doubled?

(5 pont)

Deadline expired on June 13, 2005.

### Statistics:

 20 students sent a solution. 5 points: Csire Gábor, Domonkos Tamás, Dudás János, Filus Tamás, Gondán László, Gyenis András, Kónya 495 Gábor, Lantos Judit, Paulin Roland, Pósa László, Széchenyi Gábor, Takátsy Balázs. 4 points: Hagymási Imre, Pálinkás Csaba, Szolnoki Lénárd, Werner Miklós. 1 point: 2 students. 0 point: 2 students.

Problems in Physics of KöMaL, May 2005