A cubical block of mass M and edge a sli...

A cubical block of mass M and edge a slides down a rougg inclined plane of inclination `theta` with a uniform velocity. The torque of the normal force on the block about its centre has magnitude.

`mga sin theta`

`(1)/(3)mga sin theta`

`(1)/(4)mga sin theta`

`(1)/(2) mga sin theta`

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