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Three metal rods of same lenghs and same...

Three metal rods of same lenghs and same area of cross sections having conductivities `1,2,3,` units are connected in series Then their effective conductivity will be .

A

2 units

B

`1.6` units

C

`2.4` units

D

`2.8` units

Text Solution

Verified by Experts

The correct Answer is:
B
`R_(eff) =R_(1) +R_(2) +R_(3)`
`(l_(1)+l_(2)+l_(3))/(K_(eff))=(l_(1))/(K_(1))+(l_(2))/(K_(2))+(l_(3))/(K_(3))` .
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