Mathematical and Physical Journal
for High Schools
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# Problem P. 4788. (December 2015)

P. 4788. The measure of current flowing in each of three long straight wires through every other vertex of a regular hexagon of edges $\displaystyle a=2$ cm is $\displaystyle I=10$ A. Each wire is perpendicular to the plane of the hexagon, and the direction of the current in two of the wires is upward, whilst in the third wire the current flows downward.

$\displaystyle a)$ What is the magnitude and the direction of the magnetic induction at the centre of the hexagon?

$\displaystyle b)$ What is the magnitude and the direction of the force exerted on a $\displaystyle \ell=1$ m long piece of each wire?

(4 pont)

Deadline expired on January 11, 2016.

### Statistics:

 37 students sent a solution. 4 points: Bekes Nándor, Bukor Benedek, Jakus Balázs István, Juhász 326 Dániel, Kopitkó Tünde, Molnár Mátyás, Németh 777 Róbert, Sal Kristóf, Szick Dániel. 3 points: Bartók Imre, Csire Roland, Csorba Benjámin, Hornák Bence, Iván Balázs, Kluèka Vivien, Kormányos Hanna Rebeka, Körmöczi Dávid, Mándoki László, Mány Bence, Németh Flóra Boróka, Sallai Krisztina, Stein Ármin, Szőke Dániel, Török Péter, Varga-Umbrich Eszter, Veres Tamás, Wiandt Péter, Zöllner András. 2 points: 2 students. 1 point: 3 students. 0 point: 4 students.

Problems in Physics of KöMaL, December 2015