Two wires $A$ and $B$ of same material have radii in the ratio $2: 1$ and lengths in the ratio $4: 1$. The ratio of the normal forces required to produce the same change in the lengths of these two wires is .......
  • A$1: 1$
  • B$2: 1$
  • C$1: 2$
  • D$1: 4$
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