Mathematical and Physical Journal
for High Schools
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Problem P. 4344. (April 2011)

P. 4344. A capacitor and a resistor of big resistance, through which the capacitor is charged slowly, are connected in series to a battery of electromotive force 4.5 V. The voltage across the capacitor is 3 V one minute after the closing the circuit. What will the voltage across the capacitor be

a) after 2 minutes;

b) after 3 minutes?

(4 pont)

Deadline expired on May 10, 2011.

Sorry, the solution is available only in Hungarian. Google translation

Megoldás. \(\displaystyle a)\) 4 V.

\(\displaystyle b)\) 4,33 V.


65 students sent a solution.
4 points:54 students.
3 points:2 students.
1 point:1 student.
0 point:6 students.
Unfair, not evaluated:2 solutionss.

Problems in Physics of KöMaL, April 2011