Helical motion of a particle

Electricity and Magnetism Level 2

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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