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A stationary horizontal disc is free to rotate about its axis. When a torque is applied on it, its kinetic energy as a function of θ, where θ is the angle by which is has rotated, is given as kθ2 . If its moment of inertia is I then the angular acceleration of the disc is

(1) k/I  θ

(2)  k/2I θ

(3)  k/4I θ

(4)  2k/I θ

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Correct option  (4)  2k/I θ

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