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Sahay Sir > Question Answers > Cengage NEET by C.P Singh > Part 2 > Chapter 6 - Magnetic Force, Moment and Torque > A beam of electrons is accelerated through a potential difference V. It is then passed normally through a uniform magnetic field where it moves in a circle of radius r . It would have moved in a circle of radius 2r if it were initially accelerated through a potential difference

A beam of electrons is accelerated through a potential difference V. It is then passed normally through a uniform magnetic field where it moves in a circle of radius r . It would have moved in a circle of radius 2r if it were initially accelerated through a potential difference

Protons and α-particles of equal momenta enter a uniform magnetic field normally. The radii of their orbits will have the ratio