Mathematical and Physical Journal
for High Schools
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Problem P. 4392. (December 2011)

P. 4392. A long vertical copper tube hangs on a spring balance. A small bar magnet is placed into the rod and it falls through the tube, such that it does not touch the wall of the tube. Will the reading on the spring balance change?

(4 pont)

Deadline expired on January 10, 2012.


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

Megoldás. Amikor a mágnes - az örvényáramok fékező hatása miatt - már egyenletesen mozog, az erőmérő a rézcső és a mágnes súlyának összegét mutatja.


Statistics:

157 students sent a solution.
4 points:114 students.
2 points:20 students.
0 point:20 students.
Unfair, not evaluated:3 solutions.

Problems in Physics of KöMaL, December 2011