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Sahay Sir > Question Answers > Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) > An electron of mass 0.90 × 10^−30 kg under the action of a magnetic field moves in a circle of 2.0 cm radius at a speed 3.0 ×10^6 m/s. If a proton of mass 1.8 × 10^−27 kg was to move in a circle of the same radius in the same magnetic field, then its speed will be

An electron of mass 0.90 × 10^−30 kg under the action of a magnetic field moves in a circle of 2.0 cm radius at a speed 3.0 ×10^6 m/s. If a proton of mass 1.8 × 10^−27 kg was to move in a circle of the same radius in the same magnetic field, then its speed will be

An electron is launched with velocity v in a uniform magnetic field B. The angle θ between v and B lies between 0 and π/2. Its velocity vector v returns to its initial value in a time interval of