In the following diagram, the lengths of wires $A B$ and $B C$ are equal, but the radius of wire $A B$ is double that of $B C$. The ratio of potential gradient on wires $A B$ and on $B C$ will be (wires are made of same material)
  • A$4: 1$
  • B$1: 4$
  • C$2: 1$
  • D$1: 1$
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