The drawing shows two thin rods, one made from aluminum [ ? = 23 The drawing sho

Question

The drawing shows two thin rods, one made from aluminum [? = 23

The drawing shows two thin rods, one made from aluminum [? = 23 times 10-6 (C degree)-1] and the other from steel [? = 12 times 10-6 (C degree)-1]. Each rod has the same length, the same initial temperature, and is attached at one end to an immovable wall, as shown. The temperatures of the rods are increased, both by the same amount, until the gap between the rods is closed. Where do the rods meet when the gap is closed? The rods meet exactly at the midpoint. The rods meet to the right of the midpoint. The rods meet to the left of the midpoint.

Explanation / Answer

The coefficient of expansion of aluminium is more. So for a given temperature change aluminium expands more than steel. Hence they meet right to the midpoint.

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