Helical motion of a particle

The above shows the path of a charged particle in an xyzxyz-space where a uniform magnetic field exists in the +x+x direction. When the particle is thrown at a speed of v,v, forming a 60°60° angle with the direction of the magnetic field, its path takes a helical motion as shown above. It takes TT seconds for the particle to complete a turn around. Which of the following statements is correct?

a) The particle is a positive electric charge.

b) The direction of the magnetic force is perpendicular to the direction of the magnetic field.

c) The particle moves vTvT in the +x+x direction in TT seconds.

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