Ionized hydrogen atoms and α-particles with same momenta enters perpendicular to a constant magnetic field, B. The ratio of their radii of their paths rH​:rα​ will be

Two ions have equal masses but one is singly-ionized and the other is doubly-ionized. They are projected from the same place in a uniform magnetic field with the same velocity perpendicular to the field.

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

An electron and a proton are moving on straight parallel paths with same velocity. They enter a semi- infinite region of uniform magnetic field perpendicular to the velocity . which of the following statements is/ are true ?

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