# Two rods A and B are of equal lengths. Their ends of kept between the same temperature and their area of cross-section are A_(1) and A_(2) and

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Two rods A and B are of equal lengths. Their ends of kept between the same temperature and their area of cross-section 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)A_(1)^(2) = K_(2)A_(2)^(2)
D. K_(1)^(2)A_(1)

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because H_(1) =H_(2)
therefore ((TD)/R)_(1) = ((TD)/R)_(2) (where TD = temperature difference )
or R_(1) = R_(2)
therefore 1/(K_(1)A_(1))= 1/(K_(2)A_(2)) or K_(1)A_(1) = K_(2)A_(2)