Particle Motion in a Box: Solving for Electric and Magnetic Fields

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The discussion centers on a particle moving in a box with either an electric or magnetic field. When the particle initially moves in the +x direction and later in the +y direction with increased velocity, the implication is that an electric field is present. This is because electric fields can cause changes in speed, while magnetic fields do not affect the speed of charged particles in this manner. Participants explore the distinction between the effects of electric and magnetic fields on particle motion. The conclusion drawn is that the presence of an electric field is responsible for the change in velocity direction and magnitude.
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If a particle moves in the +x direction with velocity v in a box that has either a magnetic field or an electric field, and later it is moving in the +y direction with velocity v + 5, what field is in the box?So it would be an electric field because magnetic fields can't change speed?
 
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