English Információ A lap Pontverseny Cikkek Hírek Fórum

Rendelje meg a KöMaL-t!

VersenyVizsga portál

Kísérletek.hu

Matematika oktatási portál

P. 4550. Two alike long, straight wires of diameter d, are at a distance of ; their resistance is negligible and (LD). One ends of the wires are connected through a battery of voltage U, and the other ends of the wires are connected through a resistor of resistance R. What is the value of R if the electric and magnetic forces exerted between the wires are equal?

(6 points)

Deadline expired on 10 June 2013.

Google Translation (Sorry, the solution is published in Hungarian only.)

Megoldásvázlat.

$\displaystyle R=\frac{1}{\pi} \sqrt{\frac{\mu_0}{\varepsilon_0}}\ln\frac{2D}{d}\approx 553\,\Omega.$

Statistics on problem P. 4550.
 17 students sent a solution. 6 points: Antalicz Balázs, Balogh Menyhért, Kollarics Sándor, Kovács 444 Áron, Olosz Balázs. 5 points: Sárvári Péter, Szabó 928 Attila, Váli Tamás. 4 points: 1 student. 3 points: 4 students. 2 points: 1 student. 1 point: 1 student. 0 point: 2 students.

• Problems in Physics of KöMaL, May 2013

•  Támogatóink: Morgan Stanley