Question 51 of 215

Wires A and B have identical lengths and have circular cross-sections. The radius of A is twice the radius of B i.e. rA=2rB . For a given temperature difference between the two ends, both wires conduct heat at the same rate. The relation between the thermal conductivities is given by

(a) KA=4KB                     (b) KA=2KB
(c) KA=KB/2                   (d) KA=KB/4