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A rectangular carbon block has dimension...

A rectangular carbon block has dimensions `1.0 " cm"xx1.0 " cm"xx50 " cm"`. Resistance are measured , first across two square ends and then across two respectivelt . If resistivity of carbon is `3.5xx10^(-5)Omega`-m , then values of measured resistance respectively are :

A

`(35)/(2)xx10^(-2)Omega,7xx10^(-5)Omega`

B

`7xx10^(-5)Omega,(15)/(2)xx10^(-2)Omega`

C

`(35)/(2)xx10^(-4)Omega,7xx10^(-7)Omega`

D

`(15)/(2)Omega,7xx10^(-2)Omega`

Text Solution

Verified by Experts

The correct Answer is:
A
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