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Read the assertion and reason carefully to mark the correct option out of the options given below:
\( \mathrm{P} \)
(a) If both assertion and reason are true and the reason is the
W correct explanation of the assertion.
(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.
(c) If assertion is true but reason is false.
(d) If the assertion and reason both are false.
(e) If assertion is false but reason is true.
Assertion : The equivalent thermal conductivity of two plates of same thickness in contact (series) is less than the smaller value of thermal conductivity.

Reason : For two plates of equal thickness in contact (series) the equivalent thermal conductivity is given by
[AIIMS 1997]
\[
\frac{1}{K}=\frac{1}{K_{1}}+\frac{1}{K_{2}}
\]
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