A charged particle moving along the $+ x$-axis enters a uniform magnetic field pointing along the $+ z$-axis. Because of an electric field along the $+ y$-axis, the charge particle does not change velocity. What is the sign of this particle?
A) negative
B) positive
C) The particle could be either positive or negative.
D) None of the above choices is correct.

Question

Quizplus · Accepted Answer

The electric and magnetic forces are equal and opposite, canceling each other out, which keeps the particle's velocity constant. This balance does not depend on the sign of the charge, meaning the particle could be either positive or negative.

A Charged Particle Moving Along The +x+ x+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