When the torque acting upon a system is zero, the parameter that remains constant is
When the torque acting upon a system is zero, the parameter that remains constant is
force
linear momentum
angular momentum
linear impulse
Solution
Torque acting upon a rotating body is given as
$
\tau=\frac{d \mathbf{L}}{d t}
$
where, $L=$ angular momentum.
When $\tau=0$, then
$
\begin{aligned}
& \frac{d \mathbf{L}}{d t}=0 \\
& \mathbf{L}=\text { constant }
\end{aligned}
$
$
\Rightarrow \quad \mathbf{L}=\text { constant }
$
Hence, when the torque acting upon a system is zero, then its angular momentum remains constant