An electron with mass 9.1xx10^(-31) kg m...

An electron with mass `9.1xx10^(-31)` kg moves with a speed of `2xx10^(6)m//s` in a circle of 2.85 cm radius under the influence of magnetic field. A protons of mass `1.67xx10^(-27)` kg moving in the same plane with the same speed, experiences the same centripetal force. What is the radius of the proton's orbit?

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