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A circular disc of radius b has a hole o...


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

A

`sqrt((a^(2)+b^(2)+ab)/(2))`

B

`(a+b)/(2)`

C

`sqrt((a^(2)+b^(2)+ab)/(3))`

D

`(a+b)/(3)`

Text Solution

Verified by Experts

The correct Answer is:
A
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