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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)/(sigmapi r^(2))`

B

`i^(2)((l)/(sigmapi r^(2)))^(2)`

C

`(i^(2 ) sigmal)/(pi r^(2))`

D

`( il^(2))/( sigma pi r^(2))`

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