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JEE MAIN 2022
29-07-22 S1
Question
Two metallic wires of identical dimensions are connected is series. If $\sigma_1$ and $\sigma_2$ are the conductivities of the these wires respectively, the effective conductivity of the combination is
Select the correct option:
A
$\frac{\sigma_1 \sigma_2}{\sigma_1+\sigma_2}$
B
$\frac{2 \sigma_1 \sigma_2}{\sigma_1+\sigma_2}$
C
$\frac{\sigma_1+\sigma_2}{2 \sigma_1 \sigma_2}$
D
$\frac{\sigma_1+\sigma_2}{\sigma_1 \sigma_2}$
✓ Correct! Well done.
✗ Incorrect. Try again or view the solution.
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