An electric current flows along an insulated strip $PQ$ of a metallic conductor. The current density in the strip varies as shown in the graph. Which one of the following statements could explain this variation?
- AThe strip is narrower at $P$ than at $Q$.
- BThe strip is narrower at $Q$ than at $P$.
- CThe potential gradient along the strip is uniform.
- DThe resistance per unit length of the strip is uniform.
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