Quantrex Quantrex AcademyJEE · NEET · NDA PYQs with solutions Open app
NEET 2018
Exam
NEET
Year
2018
Subject
Physics
Chapter
Rotational Motion

NEET 2018 · Physics · Rotational Motion

A solid sphere is rotating freely about its symmetric axis in free...

A solid sphere is rotating freely about its symmetric axis in free space. The radius of the sphere is increased keeping its mass same. Which of the following physical quantities would remain constant for the sphere?

Options

  1. ARotational kinetic energy
  2. BMoment of inertia
  3. CAngular velocity
  4. DAngular momentum

Correct answer

D. Angular momentum

Step-by-step solution

∵τext=dL→dt∵ {τ}_{ext} = \dfrac{d\overset{\to}{L}}{dt}

So, when τext=0⇒dL→dt=0{τ}_{ext} = 0 ⇒ \dfrac{d\overset{\to}{L}}{dt} = 0

⇒L→=⇒ \overset{\to}{L} = constant

So angular momentum remains constant.
Practice Rotational Motion on Quantrex Academy →

More from Rotational Motion

A solid sphere A of radius R and mass M is attached at a point to a smaller solid sphere… NEET 2026The angular speed of a flywheel is increased from 600 rpm to 1200 rpm in 10 s. The number… NEET 2026A thin wire of length ' L ' and linear mass density ' m ' is bent into a circular ring… NEET 2026A thin horizontal disc is rotating about a vertical axis passing through its fixed centre… NEET 2026The Sun rotates around its centre once in 27 days. What will be the period of revolution… NEET 2025A sphere of radius R is cut from a larger solid sphere of radius 2 R as shown in the… NEET 2025The radius of gyration of a solid sphere of mass 5 kg about X Y is 5 m as shown in… NEET 2024A wheel of a bullock cart is rolling on a level road as shown in the figure below. If its… NEET 2024 Full Rotational Motion list All NEET PYQs