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

Problem P. 4534. (April 2013)

P. 4534. What is the value of the resistance of the variable resistor R shown in the figure, when

a) the condenser is uncharged;

b) the voltage across the condenser is exactly half of U?

(4 pont)

Deadline expired on May 10, 2013.


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

Megoldásvázlat. \(\displaystyle a)\) \(\displaystyle R=72~\Omega\).

\(\displaystyle b)\) \(\displaystyle R=\frac{63}{11}~\Omega\approx 5{,}7~\Omega\).


Statistics:

76 students sent a solution.
4 points:60 students.
3 points:11 students.
2 points:4 students.
0 point:1 student.

Problems in Physics of KöMaL, April 2013