Two different subatomic particles (A and B) pass through a uniform field as shown below.  The upper plate is positively charged and the lower plate is negatively charged. Which best describes the charges on the particles as they travel through each field?              Charge A     Charge BGroup of answer choicesPositive      positivePositive      negativenegative     positivenegative      negative

The question is asking about the charges on two subatomic particles (A and B) as they pass through a uniform field. The field is set up such that the upper plate is positively charged and the lower plate is negatively charged.

The direction in which a charged particle moves in a field depends on its charge. A positively charged particle will be attracted to the negative plate and repelled by the positive plate, causing it to move downwards. Conversely, a negatively charged particle will be attracted to the positive plate and repelled by the negative plate, causing it to move upwards.

Without a diagram, it's hard to determine the exact paths of particles A and B. However, if we assume that particle A is moving upwards and particle B is moving downwards, then particle A would be negatively charged (since it's moving towards the positive plate) and particle B would be positively charged (since it's moving towards the negative plate).

So, the answer would be: Charge A: Negative Charge B: Positive