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  4. Under a constant torque, the angular momentum of a body changes from A to 4 A in 4 s . The torque is

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Q. Under a constant torque, the angular momentum of a body changes from $A$ to $4 \,A$ in $4 s$ . The torque is

Bihar CECEBihar CECE 2013System of Particles and Rotational Motion

Solution:

Change in angular momentum $=$ Torque $\times$ time
$\Rightarrow $ Torque $=\frac{4 A-A}{4}=\frac{3}{4} A$