A mild steel bar is in three parts, each $20 c m$ long. The diameters of parts $A B$ , $B C$ and $C D$ are $2 c m$ , $1 c m$ and

$3 c m$

- 1
  $9$
- 2
  
  $4$
- 3
  
  $3$
- 4
  
  $2$

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