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Units and Dimensions

A constant to...

Question

A constant torque acting on a uniform circular wheel changes its angular momentum from a to 4A in 4S. the torque acted on it is

A

\frac{3 A}{4}

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B

\frac{A}{4}

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C

\frac{2 A}{3}

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D

\frac{3 A}{2}

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Solution

The correct option is A $\frac{3 A}{4}$
Rate of change of angular momentum is known as torque τ

τ = change in angular momentum / time

= 4A -A / 4

= 3A/4

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