Q131 / 150 · JEE Main 2006 · Physics

A force of $-F \hat{k}$ acts on $O$, the origin of the coordinate system. The torque about the point $(1,-1)$

  • A
    $-F(\hat{i}-\hat{j})$
  • B
    $F(\hat{i}-\hat{j})$
  • Correct answer
    C
    $-F(\hat{i}+\hat{j})$
  • D
    $F(\hat{i}+\hat{j})$

Solution

$\vec{\tau}=(-\hat{i}+\hat{j}) \times(-F \hat{k})$ $=-F(\hat{i}+\hat{j})$

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

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