Under the influence of a uniform magnetic field a charged particle is moving in a circle of radius R with constant speed v. The time period of the motion
depends on both R and v
is independent of both R and v
depends on R and not on v
depends on v and not on R
When a test charge enters a magnetic field
directed along z-axis, with a velocity
making angles d with the z-axis. The time period of the motion is independent of R and v.