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A particle, of mass 4.11×10-25 kg, has the same charge as an electron, but positive, moves...

A particle, of mass 4.11×10-25 kg, has the same charge as an electron, but positive, moves in a circle of radius 8.03m at constant speed, due to the action a magnetic field of 0.0036 Tesla, directed perpendicular to the plane of the circle. What is the speed of the particle in m/s?

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