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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.

A

zero

B

Mga

C

Mg(a/2) sin `theta`

D

Mga cos `theta`

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The correct Answer is:
C
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