Question 6: Centre of Mass and Rotational Motion

Question

Assertion The angular momentum of
system always remain constant.
Reason For a system, $$	au_{\mathrm{ext}}=\frac{d L}{d t}=0$$

Accepted Answer

$$\begin{aligned}
& 	ext { } 	au_{\mathrm{ext}}=\frac{d L}{d t}=0 \
& \Rightarrow \frac{d L}{d t}=0 \Rightarrow L=	ext { constant, i.e. } L_{	ext {initial }}=L_{	ext {final }}
\end{aligned}$$

Answer

Both Assertion and Reason are correct, Reason is the correct explanation of Assertion

Answer

Both Assertion and Reason are correct but Reason is not the correct explanation of Assertion

Answer

Assertion is correct and Reason is incorrect

Answer

Assertion is incorrect and Reason is correct

Centre of Mass and Rotational Motion

Assertion The angular momentum of system always remain constant. Reason For a system, $\tau_{\mathrm{ext}}=\frac{d L}{d t}=0

Choose the correct answer: