Q94 / 160 · JIPMER 2006 · Physics

The angular momentum of a rotating body changes from $A_0$ to $4 A_0$ in 4 seconds. The torque acting on the body is :

  • Correct answer
    A
    $3 / 4 A_0$
  • B
    $4 A_0$
  • C
    $3 A_0$
  • D
    $3 / 2 A_0$

Solution

Torque $\begin{aligned} \tau=\frac{d L}{d t} & =\frac{\left(4 A_0-A_0\right)}{4} \\ & =\frac{3 A_0}{4} .\end{aligned}$

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

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