# Particles in magnetic field

The above shows the moving paths of four particles $$A$$, $$B$$, $$C$$ and $$D$$ in a uniform magnetic field. Which of the following statements is correct?

a) Particles $$A$$ and $$B$$ are charged oppositely.

b) Particle $$C$$ is an electrically charged particle.

c) Particle $$D$$ is electrically neutral.

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