Mathematical and Physical Journal
for High Schools
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Problem P. 4141. (February 2009)

P. 4141. A rechargeable battery of 12 V is connected to a coil of self inductance 20 H and of resistance 30 \Omega. What is the rate of change of the current when the current through the coil is 200 mA? How much energy is stored in the coil when the equilibrium is established?

(4 pont)

Deadline expired on March 11, 2009.


Statistics:

58 students sent a solution.
4 points:Balassa Péter, Barancsuk Lilla, Béres Bertold, Csányi Gergely, Deák Zsolt, Égető Tamás, Egyed Zsombor, Emroz Khan, Ercsey Tamás, Fonai Dániel, Földes Imre, Garaguly Gergő, Harnos Balázs, Hartstein Máté, Iván Dávid, Jéhn Zoltán, Kardos Örs, Kovács Attila, Kunsági-Máté Éva, Laczkó Zoltán Balázs, Lovas Lia Izabella, Lőrincz Dóra, Maknics András, Mayer Martin János, Najbauer Eszter Éva, Pálovics Péter, Rácz Viktor, Réti Dávid, Schwarcz Gergő, Somogyi József, Sós Attila Róbert, Szük Dániel, Tamási Mátyás, Tóth 222 Barnabás, Török 999 Csaba, Trényi Róbert, Varga 730 Viktor, Varju 105 Tamás, Vécsi Áron, Vörös Beáta, Wang Daqian, Zelei Kristóf.
3 points:12 students.
2 points:4 students.

Problems in Physics of KöMaL, February 2009