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26. Four spheres, each of mass and radius are situated at the four corners of square of side . The moment of inertia of the system about an axis perpendicular to the plane of square and passing through its centre will be

(a)    (5/2)M  (4r2 +5R2)

(b)    (2/5)M (4r2+5R2)

(c)    (2/5)M  (4r2 +5r2)

(d)    (5/2)M  (4r2 +5r2)

Ans. b

(20)

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