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A particle of mass \( m \) and radius of gyration \( \mathrm{K} \) is rotating with an angular acceleration \( \alpha \).
\( \mathrm{P} \) The torque acting on the particle is

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(1) \( \frac{1}{2} m \mathrm{~K}^{2} \alpha \)
(2) \( m \mathrm{~K}^{2} \alpha \)
(3) \( m \mathrm{~K}^{2} / \alpha \)
(4) \( \frac{1}{4} m \mathrm{~K}^{2} \alpha^{2} \)
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