Mathematical and Physical Journal
for High Schools
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I want the old design back!!! :-)

Problem P. 3872. (February 2006)

P. 3872. Two coils are placed to the same closed iron core. The number of turns of the two coils are equal, and the sense of their winding is a) the same, b) opposite. The switch, which has been closed for a long time, is suddenly opened. Find the current in the different branches right after turning off the switch (see figure).

(5 pont)

Deadline expired on March 13, 2006.


15 students sent a solution.
5 points:Csire Gábor, Engedy Balázs, Fülöp Bálint, Gresits Iván, Konczer József, Kónya 495 Gábor, Nagy 555 Zoltán, Pásztor Attila, Rácz 206 György, Széchenyi Gábor, Werner Miklós.
3 points:1 student.
2 points:2 students.
1 point:1 student.

Problems in Physics of KöMaL, February 2006