A steel rod long and of cross-sectional area conducts heat steadily between its ends…

PHYSICS · Subjective · CBSE · Physics · Thermal Properties of Matter · Thermal Properties of Matter

Problem

A steel rod

40\,\text{cm}

long and of cross-sectional area

5.0\,\text{cm}^2

conducts heat steadily between its ends kept

60\,\text{K}

apart. Keeping the temperature difference unchanged, the area is reduced by

20\%

and the length is increased by

10\%

. Calculate the percentage change in the heat current caused by these modifications.