question_answer

Two wires of the same dimensions but resistivities  \[{{\rho }_{1}}\] and \[{{\rho }_{2}}\] connected in series. The equivalent resistivity of the combination is:

A) \[{{\rho }_{1}}+{{\rho }_{2}}\]           

B) \[\frac{{{\rho }_{1}}+{{\rho }_{2}}}{2}\]

C) \[2\,({{\rho }_{1}}+{{\rho }_{2}})\]                  

D) \[\sqrt{{{\rho }_{1}}{{\rho }_{2}}}\]