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A current i passes through a wire of len...

A current i passes through a wire of length l , radius of cross-section r and resistivity `rho` . The rate of heat generation is

A

`(i^(2)l)/(sigma pi r^(2))`

B

`i^(2) ((l)/( sigma pi r^(2)))^(2)`

C

`(i^(2) sigma l)/(pi r^(2))`

D

`(il^(2))/(sigma pir^(2))`

Text Solution

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The correct Answer is:
A
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