Q128 / 160 · TS EAMCET 2023 (14 May Shift 2) · Physics

A constant torque acting on a uniform circular wheel changes its angular momentum from $\mathrm{A}_0$ to $4 \mathrm{~A}_0$ in 4 seconds. The magnitude of the torque is

  • Correct answer
    A
    $\frac{3 \mathrm{~A}_{\mathrm{o}}}{4}$
  • B
    $\mathrm{A}_0$
  • C
    $4 \mathrm{~A}_0$
  • D
    $12 \mathrm{~A}$

Solution

Torque $\tau=\frac{\Delta \mathrm{L}}{\Delta \mathrm{t}}=\frac{4 \mathrm{~A}_0-\mathrm{A}_0}{4}=\frac{3}{4} \mathrm{~A}_0$

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

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