Two metallic rods are connected in series. Both are of same materia...

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Two metallic rods are connected in series. Both are of same material of same length and same area of cross-section. If
\( \mathrm{P} \) the conductivity of each rod be \( k \), then what will be the conductivity of the combination?
W
(A) \( 4 k \)
(B) \( 2 k \)
(C) \( k \)
(D) \( k / 2 \)
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