1.

Two rods A and B are of equal lengths. Their ends are kept between the same temperature and their area of cross-sections are \[{{A}_{1}}\]and \[{{A}_{2}}\]and thermal conductivities \[{{K}_{1}}\] and \[{{K}_{2}}\]. The rate of heat transmission in the two rods will be equal, if

A. \[{{K}_{1}}{{A}_{2}}={{K}_{2}}{{A}_{1}}\]
B. \[{{K}_{1}}{{A}_{1}}={{K}_{2}}{{A}_{2}}\]
C. \[{{K}_{1}}={{K}_{2}}\]
D. \[{{K}_{1}}A_{1}^{2}={{K}_{2}}A_{2}^{2}\]
Answer» C. \[{{K}_{1}}={{K}_{2}}\]


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