Answer:
[tex]\frac{1}{7}[/tex]
Explanation:
We have given the ratio of resistivities [tex]\frac{\rho _2}{\rho _1}=7[/tex]
The resistance of any material is given by [tex]R=\frac{\rho l}{A}[/tex]
From the relation we can see that resistance is directly proportional to the resistivity of the material so [tex]\frac{R_2}{R_1}=7[/tex]
According to ohm's law we know that V =iR
From this relation we can see that potential difference is directly proportional to the resistance so [tex]\frac{\Delta V_1}{\Delta V_2}=\frac{1}{7}[/tex]
