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Intro to Torque

A constant to...

Question

A constant torque acting on a uniform circular wheel changes its angular momentum from $A$ to $4 A$ in $4$ sec. The torque is:

A

\frac{3 A}{4}

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B

\frac{A}{4}

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C

\frac{2 A}{4}

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D

\frac{3 A}{2}

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Solution

The correct option is A $\frac{3 A}{4}$
Since,
$T o r q u e = \frac{d L}{d t}$
$T = \frac{(4 A - A)}{4}$
$T = \frac{3 A}{4}$

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