question_answer

If the resistivity of a potentiometer wire be \[\rho \] and area of cross-section be A, then what will be potential gradient along the wire                                                [RPET 1996]

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

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

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

D)            \[IA\rho \]