The metal rods of same length and same area of cross-section are connected in series. If their condcutivites are `120 Wm^(-1) an

The metal rods of same length and same area of cross-section are connected in series. If their condcutivites are `120 Wm^(-1) and 240 Wm^(-1) K^(-1)` the effective conductivity of the combination is
A. `150 Wm^(-1)" " K^(-1)`
B. `160 Wm^(-1)" " K^(-1)`
C. `180 Wm^(-1)" " K^(-1)`
D. `80 Wm^(-1)" " K^(-1)`

The metal rods of same length and same area of cross-section are connected in series. If their condcutivites are `120 Wm^(-1) and 240 Wm^(-1) K^(-1)`

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