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Q.

Suppose a disc is rotating counter clockwise in the plane of the paper then 
 

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a

It’s angular velocity vector will be perpendicular to the page pointing up out of the page 
 

b

None of the above is correct. 
 

c

It’s angular velocity vector acts along the tangent to the disc 
 

d

It’s angular velocity vector will be perpendicular to the page pointing inwards 
 

answer is A.

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Detailed Solution

For clockwise motion of the particle, we can find the direction of ω by right hand rule.
Curls of finger in direction of motion and thumb will give direction of ω
∴ direction of ω is perpendicular inside plane of paper.

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