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

Problem P. 4086. (September 2008)

P. 4086. A black box has two leads. If a zero-centre ammeter and a rechargeable battery of 6 V voltage, whose internal resistance is negligible, are connected to the leads as shown in the figure, the ammeter reads 1 A. If the terminals of the battery are swapped, and connected again into he circuit, then the measured current is 0.5 A.

What is in the box?

(4 pont)

Deadline expired on October 13, 2008.


166 students sent a solution.
4 points:104 students.
3 points:25 students.
2 points:14 students.
1 point:13 students.
0 point:10 students.

Problems in Physics of KöMaL, September 2008