# Helical motion of a particle

The above shows the path of a charged particle in an $$xyz$$-space where a uniform magnetic field exists in the $$+x$$ direction. When the particle is thrown at a speed of $$v,$$ forming a $$60°$$ angle with the direction of the magnetic field, its path takes a helical motion as shown above. It takes $$T$$ 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 $$vT$$ in the $$+x$$ direction in $$T$$ seconds.

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