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Electricity and Magnetism

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Direction of Motion of a Charged Particle in a Magnetic Field

EANDM-RVMYYY

A particle with a negative charge $-q$ is injected into a magnetic field with a velocity $v_o$. The velocity is initially in the (x-y) plane, and the magnetic field is directed in the positive $\hat{z}$ axis.

Looking down onto the (x-y) plane from the positive z direction (that is, the magnetic field is pointing towards you), what most correctly describes the motion of the particle?

A

The motion is helical, circulating in (x-y) but coming towards you.

B

The motion is circular in the (x-y) plane, in a counter-clockwise direction.

C

The motion is circular in the (x-y) plane, in a clockwise direction.

D

The motion is helical, circulating in the (x-y) plane, but going away from you.