question_answer

The specific resistivity p of a circular wire of radius r, resistance R and length l is given by \[\rho \frac{\pi {{r}^{2}}R}{l}\]Given, \[r=(324\pm 0.02)cm\] \[R=(30\pm 1)\Omega \]and\[l=(4.80\pm 0.01)cm\] The percentage error in \[\rho \] is nearly

A) 7%                                         

B) 20%

C) 18%                                       

D) None of these