Wires $A$ and $B$ are made from the same material. $A$ has twice the diameter and three times the length of $B.$ If the elastic limits are not reached, when each is stretched by the same tension, the ratio of energy stored in $A$ to that in $B$ is
  • A$2:3$
  • B$3:4$
  • C$3:2$
  • D$6:1$
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