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A wall has two layers \( A \) and \( B \) made of different materials. The thickness of both the layers is the same. The thermal \( \mathrm{P} \) conductivity of \( A \) and \( B \) are \( K_{A} \) and \( K_{B} \) such that \( K_{A}=3 K_{B} \). The temperature across the wall is \( 20^{\circ} \mathrm{C} \). In thermal W equilibrium
[CPMT 1998; Similar Kerala PET 2012]
(a) The temperature difference across \( A=15^{\circ} \mathrm{C} \)
(b) The temperature difference across \( A=5^{\circ} \mathrm{C} \)
(c) The temperature difference across \( A \) is \( 10^{\circ} \mathrm{C} \)
(d) The rate of transfer of heat through \( A \) is more than that through \( B \)
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