A Charged Particle Moving Along The $+ x$ -Axis Enters a Uniform Magnetic Field Pointing Along The

A charged particle moving along the $+ x$ -axis enters a uniform magnetic field pointing along the $+ z$ -axis. A uniform electric field is also present. Due to the combined effect of both fields, the particle does not change its velocity. What is the direction of the electric field?

A) along the $- x$ -axis
B) along the $+ y$ -axis
C) along the $+ x$ -axis
D) along the $- z$ -axis
E) along the $- y$ -axis

Correct Answer:

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