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) \[i\,l\,\rho \,/\,r\]
Correct Answer: A
Solution :
\[H={{i}^{2}}Rt\] Þ \[\frac{H}{t}={{i}^{2}}R=\frac{{{i}^{2}}\rho l}{\pi \,{{r}^{2}}}\]
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