electrostatic -7

A particle of charge q and mass m is moving in a circular orbit of radius r with angular
speed ω. Another particle of charge 2q and mass 2m is moving in a circular orbit of
radius 2r with the same angular speed ω. Let μ₁ and μ₂, respectively, be the
magnitudes of the magnetic dipole moments of the two particles arising because of
their orbital motion. Then the ratio μ₂ / μ₁ is equal to
A) 2 B) 4 C) 8 D) 16