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# Two rods of equal length and diameter have thermal conductivities 3 and 4 units respectively. If they are joined in series, the thermal conductivity of the combination would be (A) 3.43 (B) 3.5 (C) 3.4 (D) 3.34

Arun
25763 Points
one year ago
As we know that both rods are joined in series, so equivalent thermal conductivity will be K1​+K2​
Now, we know that
R=KAL​
So,
Kequivalent​2L​=K1​L​+K2​L​
Kequivalent​2L​=3L​+4L​
Kequivalent​=724​
Kequivalent​=3.43
Thus option A is correct.
Vikas TU
14149 Points
one year ago

When we talk about thermal conductivity we can set up same chronology with capacitance or parallel equivalent resistance logic

So same rule will follow for that

1/R = 1/R1 + 1/R2 + 1/R3 +...................

So you will get answer 6/5