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An electron of mass \( 0.90 \times 10^{-30} \mathrm{~kg} \) under the action of a magnetic field moves in a circle of \( 2.0 \mathrm{~cm} \) radius at a speed of \( 3.0 \times 10^{6} \mathrm{~ms}^{-1} \). If a proton of mass \( 1.8 \times 10^{-27} \mathrm{~kg} \) was to move in a circle of the same radius in the same magnetic field, then its speed will be
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