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A disc of moment of inertia I1, is rotat...

A disc of moment of inertia `I_1`, is rotating in horizontal plane about an axis passing through its centre and perpendicular to its plane with constant angular speed `omega_1`. Another disc of moment of inertia `I_2` having angular speed `omega_2` The energy lost by the initial rotating disc is

A

`1/2 [(I_1 + I_2)/(I_1I_2)]` `omega_1^2`

B

`1/2 [(I_1 I_2)/(I_1 - I_2)]` `omega_1^2`

C

`1/2 [(I_1 - I_2)/(I_1I_2)]` `omega_1^2`

D

`1/2 [(I_1I_2)/(I_1 + I_2)]` `omega_1^2`

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