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Rotational Motion question

2019 · 12 Apr · Shift 1 · Q67
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  5. /2019 · 12 Apr · Shift 1 · Q67

Rotational Motion question

2019 · 12 Apr · Shift 1 · Q67

JEE MainPhysicsRotational MotionMCQ+4 / −1
A circular disc of radius b has a hole of radius a at its centre (see figure). If the mass per unit area of the disc varies as (σ0r)\left( {{{{\sigma _0}} \over r}} \right)(rσ0​​) , then the radius of gyration of the disc about its axis passing through the centre is: JEE Main 2019 (Online) 12th April Morning Slot Physics - Rotational Motion Question 161 English
  1. A
    a2+b2+ab2\sqrt {{{{a^2} + {b^2} + ab} \over 2}}2a2+b2+ab​​
  2. B
    a+b3\sqrt {{{a + b} \over 3}}3a+b​​
  3. C
    a2+b2+ab3\sqrt {{{{a^2} + {b^2} + ab} \over 3}}3a2+b2+ab​​
  4. D
    a+b2\sqrt {{{a + b} \over 2}}2a+b​​
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