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IIT JEE Exam 2020 : Physics

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Aquaman- King of the Seven Seas
Iit Jee, India
XI,XII Science
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JEE (Advanced) 2020 Q.1 A football of radius R is kept on a hole of radius r ( < ) made on a plank kept horizontally. One end of the plank is now lifted so that it gets tilted making an angle from the horizontal as shown in the figure below. The maximum value of so that the football does not start rolling down the plank satisfies (figure is schematic and not drawn to scale) (A) sin = Q.2 Paper 1 (B) tan = (C) sin = 2 (D) cos = 2 A light disc made of aluminium (a nonmagnetic material) is kept horizontally and is free to rotate about its axis as shown in the figure. A strong magnet is held vertically at a point above the disc away from its axis. On revolving the magnet about the axis of the disc, the disc will (figure is schematic and not drawn to scale) (A) rotate in the direction opposite to the direction of magnet s motion (B) rotate in the same direction as the direction of magnet s motion (C) not rotate and its temperature will remain unchanged (D) not rotate but its temperature will slowly rise 1/11

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