Question

Assertion :If a particle moves with a constant velocity, the angular momentum of this particle about any point remains constant. Reason: Angular momentum has the units of Plank's constant.

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Both Assertion and Reason are incorrect

Answer 1

The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

Angular momentum

$L=mvr$

$\frac{dL}{dt}=mr\frac{dv}{dt}$

If velocity is constant so

$\frac{dv}{dt}=0$

And

$\frac{dL}{dt}=0$

$L=cons\tan t$

If a particle moves with a constant velocity, the angular momentum of this particle about any point remains constant.

So, assertion is true.

The units of angular momentum and plank’s constant are same.

Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion.