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19. Let  be the moment of inertia of an uniform square plate about an axis AB that passes through its centre and is parallel to two of its sides. CD is a line in the plane of the plate that passes through the centre of the plate and makes an angle θ  with AB . The moment of inertia of the plate about the axis CD is then equal to

(a)   l                     

(b)   l sin2θ                                  

(c)   l cos2θ                        

(d)  l   cos2θ/2                 

Ans. a      

(7)

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