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Torque

A constant to...

Question

A constant torque acting on a uniform circular wheel changes its angular momentum from $A_{0}$ to 4 $A_{0}$ in 4 seconds, the magnitude of the torque is

A

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C

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D

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Solution

The correct option is C

$T = \frac{L_{f} - L_{i}}{t}$ where L=Angular momentum
$\Rightarrow= \frac{4 A_{0} - A_{0}}{4} \Rightarrow T = \frac{3 A_{0}}{4}$

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