1.

A current i passes through a wire of length l, radius of cross-section r and resistivity r. The rate of heat generation is [AMU (Med.) 1999]

A.            \[\frac{{{i}^{2}}l\rho }{\pi {{r}^{2}}}\]                            
B.            \[{{i}^{2}}{{\left( \frac{l\rho }{\pi {{r}^{2}}} \right)}^{2}}\]
C.            \[{{i}^{2}}l\,\rho \,/\,r\]  
D.            \[i\,l\,\rho \,/\,r\]
Answer» B.            \[{{i}^{2}}{{\left( \frac{l\rho }{\pi {{r}^{2}}} \right)}^{2}}\]


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