Q196 / 200 · Manipal (MET) 2010 · Physics

A constant torque acting on a uniform circular wheel changes its angular momentum from $A_0$ to $4 A_0$ in 4 s . The magnitude of this torque is

  • Correct answer
    A
    $\frac{3 A_0}{4}$
  • B
    $A_0$
  • C
    $4 A_0$
  • D
    $12 A_0$

Solution

Torque $\vec{\tau}=\frac{\overrightarrow{\mathrm{dL}}}{d t}=\frac{L_2-L_1}{\Delta t}=\frac{4 A_0-A_0}{4}=\frac{3 A_0}{4}$

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

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