The behavior of the ball will be like a pendulum kind of motion swinging between the two charged plates.
The positive ball would go toward the negatively charged plate first. After which, it would lose the positive charge and becomes negatively charged. Due to the negative charge, it will repel the negatively charged plate and will start traveling towards the positive plate this time.
The process would continue which will create a pendulum kind of motion for the charged light metal ball between the plates, and this will continue until either of the one the positive or the negative plate became neutral (discharged).
Hence, the behavior of the ball will be like a pendulum kind of motion swinging between the two charged plates.
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