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A particle of mass m, charge Q and kinetic energy T enters a transverse uniform magnetic field of induction $ \overrightarrow B$. After 3 seconds the kinetic energy of the particle will be :

$\begin {array} {1 1} (1)\;4T & \quad (2)\;3T \\ (3)\;2T & \quad (4)\;T \end {array}$

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