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