JEE Advanced 2020 Full Test 3 Paper 2

A charge particle q of mass m is placed at a distance d from another charge particle −2q of mass 2m in a uniform magnetic field B as shown. If particles are projected towards each other with equal speed v0, so that the two particles touches each other without collision during its motion.
(Assume only force due to magnetic field acts on the particle)
q───────▶v0⊗B

v0

◀───────

−2q