The radius of gyration of a rotating metallic disc is independent of the following physical quantity Position of axis of rotation Mass of disc Radius of disc Temperature of disc
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Moment of inertia of a body depends upon Distribution of mass of the body Position of axis of rotation Temperature of the body All are above
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Raw and boiled egg are made to spin on a smooth table by applying the same torque . The egg that spin faster is Raw egg Boiled egg Both will have same spin rate Difficult to predict
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A uniform metal rod is rotated in horizontal plane about a vertical axis passing through its end at uniform rate . The tension in the rod is Same all point Different at different point and maximum at centre of rod Different at different point and minimum at axis of rotation Different at different point and maximum at axis of rotation
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16. A positive charge ‘Q’ is fixed at a point . A negatively charged particle of mass ‘m’ and charge ‘q’ is revolving in a circular path of radius 𝑟_1 with Q as the centre . The work to be done to charge the radius of the circular path from 𝑟_1 to 𝑟_2 in joules is 0 𝑞𝑄/(4𝜋∈_0 ) [1/𝑟_1 −1/𝑟_2 ] 𝑞𝑄/(4𝜋∈_0 ) [1/𝑟_1 −1/𝑟_2 ] 1/𝑘 𝑞𝑄/(4𝜋∈_0 ) [1/𝑟_2 −1/𝑟_1 ]
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14. Two positive charges 12𝜇C and 10 𝜇C are initially separated by 10cm . The work done in bringing the two charges 4cm closer is 7.2 J 3.6 J 8.4J 12.4J
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