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Thermal current through a bar is inversely proportional to which quantity?
AIts layers
BIts ledges
CIts length
DIts labels
Answer & Solution
Correct answer: C. Its length
1. Conduction depends on the geometry of the conductor.
2. A longer path makes the flow harder.
3. The heat current is inversely proportional to the length.
4. It is proportional to the temperature difference and the area of cross-section.
_Source: NCERT Class XI Physics Part II, Ch 10 'Thermal Properties of Matter'_
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