Q. Which of the following quantities is conserved in the absence of external torques?

निम्नलिखित में से कौन सी मात्रा बाह्य बलाघूर्णों की अनुपस्थिति में संरक्षित रहती है?

A
Linear momentum
रेखीय संवेग
B
Angular momentum
कोनेदार गति
C
Kinetic energy
गतिज ऊर्जा
D
Potential energy
संभावित ऊर्जा

Explanation

In the absence of external torque, angular momentum remains constant. This is a fundamental principle in physics known as the conservation of angular momentum, expressed as:

dLdt=τext=0⇒L=constant\frac{dL}{dt} = \tau_{\text{ext}} = 0 \Rightarrow L = \text{constant}

where L=IωL = I\omega, the product of moment of inertia and angular velocity.

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