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JEE Main Physics question

PhysicsSystems of Particles and Rotational MotionJEE Main

The moment of inertia of a metre scale of mass 0.6 kg, about an axis perpendicular to the scale and located at the 20 cm mark, is (breadth of the scale negligible)

Answer: (A)

Solution

Mass per unit length kg/cm. Part (0 to 20 cm, length 20 cm, mass kg) and part (20 to 100 cm, length 80 cm, mass kg), each treated as a uniform rod about an end. $I =

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Question ID VK-158464