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A round disc of moment of inertia I2 abo...

A round disc of moment of inertia `I_2` about its axis perpendicular to its plane and passing through its centre is placed over another disc of moment of inertia `I_1` rotating with an angular velocity `omega` about the same axis. The final angular velocity of the combination of discs is :-

A

`omega`

B

`(I_(1)omega)/(I_(1)+I_(2))`

C

`((I_(1)+I_(2))omega)/(I_(1))`

D

`(I_(2)omega)/(I_(1)+I_(2))`

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