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In a potentiometer circuit there is a cell of $e.m.f.$ $2\, volt$, a resistance of $5\, ohm$ and a wire of uniform thickness of length $1000\, cm$ and resistance $15\, ohm$. The potential gradient in the wire is
  • A$\frac{1}{{500}}\,V/cm$
  • B$\frac{3}{{2000}}\,V/cm$
  • C$\frac{3}{{5000}}\,V/cm$
  • D$\frac{1}{{1000}}\,V/cm$
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