- increase in length is proportional to area of cross section A
- increase in length is inversely proportional to its length L
- increase in length is inversely proportional to A
- none of the above

Answer: Option 3

Explanation:

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Wenn [der Lehrer] wirklich weise ist, fordert er euch nicht auf, ins Haus seiner Weisheit einzutreten, sondern führt euch an die Schwelle eures eigenen Geistes.

-Kahlil Gibran