Two discs of same material and thickness have radii 0.2 m and 0.6 m.

⇦

⇨

Two discs of same material and thickness have radii 0.2 m and 0.6 m. Their moments of inertia about their axes will be in the ratio

Options

(a) 1 : 81
(b) 1 : 27
(c) 1 : 9
(d) 1 : 3

Correct Answer:

1 : 81

Explanation:

I = (1/2) MR² = (1/2) (πR²t ρ) R² = πtρR⁴ / 2
t and p are same
I₁/I₂ = [R₁/R₂]⁴ = [0.2 / 0.6]⁴ = 1 / 81.

Related Questions:

1. The unit of thermal conductivity is
2. The magnetic susceptibility of a material of a rod is 299. Permeability of vacuum
3. Which of the following quantities has units but not dimensions
4. A DC ammeter has resistance 0.1Ω and its current ranges 0-100A. If the range
5. Under the action of a force F=cx, the position of a body changes from 0 to x.The work done

Topics: Motion of system of Particles and Rigid Body (73)
Subject: Physics (2479)

---

Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score

18000+ students are using NEETLab to improve their score. What about you?

Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.

---

Share this page with your friends