question_answer

If the specific resistance and area of cross section of a potentiometer wire are \[\rho \] and A and\[I\]is current flowing through it, then potential gradient is:

A) \[\frac{I\rho }{A}\]                                         

B)        \[\frac{I}{A\rho }\]                         

C)        \[\frac{IA}{\rho }\]                                         

D)        \[IA\rho \]