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Conductivity of a conductor of length L ...

Conductivity of a conductor of length L and radius of cross-section r at temperature `t^(@) C ` is `sigma ` . If its length is doubled and radius is halved at same temperature, then new conductivity of the conductor will be

A

`sigma`

B

`4 sigma`

C

` ( sigma)/(2)`

D

` ( sigma)/(4)`

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