G(1), G(2), G(3) are the conductances of...

`G_(1), G_(2), G_(3)` are the conductances of three conductors. What will be their equivalent conductance when they are connected, (i) in series (ii) in parallel.

A

`sigma_1+sigma_2 +sigma_3`

B

`1/sigma_1+2/sigma_2 +1/sigma_3`

C

`(sigma_1sigma_2sigma_3)/(sigma_1+sigma_2+sigma_3)`

D

none of these

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The correct Answer is:

D

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