Question

Isometric view of a solid copper object is shown below. If a constant heat source of 100 degrees C is applied at the point P continuously, which point on the solid will reach the temperature of the heat source the earliest? Neglect heat losses and assume point P lies on an equilateral triangle.

• A. A
• B. B
• C. C
• D. D

Hint:

Imagine a thermal front spreading through the uniform copper from P. Compare the shortest straight-line distance through the solid from P to each labelled point.

Answer 1

The Correct Option is D

Step 1: Heat follows shortest path.
Conduction reaches a point fastest along the shortest route through the solid.
Step 2: Compare distances.
Point D has the shortest conductive path from P, so it heats first.
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