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 ( {\\sigma_{0}}/{r} ) then the radius of gyration of the disc about its axis passing through the centre is. [12 Apr 2019 Shift 1]

Correct Answer is : √a2+b2+ab3

\sqrt{ { {a}^{2}+ {b}^{2}+ {ab}}/{2}}

\sqrt{ { {a}^{2}+ {b}^{2}+ {ab}}/{3}}

JEE Main 12 Apr 2019 Paper 1 Solved Paper

Section: Physics

Question : 12 of 90

Marks: +1, -0

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 (

σ0

) then the radius of gyration of the disc about its axis passing through the centre is.

[12 Apr 2019 Shift 1]

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