A wire elongates by $\ell \mathrm{mm}$ when a load $\mathrm{W}$ is hanged from it. If the wire goes over a pulley and two weights $\mathrm{W}$ each are hung at the two ends, the elongation of the wire will be (in $\mathrm{mm}$ )

• A

  $\ell / 2$
• Correct answer
  B

  $\ell$
• C

  $2 \ell$
• D

  zero

Hence, the correct answer is option: 'B'.