$A$ potentiometer has a uniform potential gradient. The specific resistance (resistivity) of the material of the potentiometer wire is $10^{-7} \, \Omega \cdot m$, the current passing through it is $0.1 \, A$, and the cross-sectional area of the wire is $10^{-6} \, m^2$. The potential gradient along the potentiometer wire is:
- A$10^{-4} \, V/m$
- B$10^{-6} \, V/m$
- C$10^{-2} \, V/m$
- D$10^{-8} \, V/m$
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