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Which one of the following statements is correct ?

1. The balls will execute simple harmonic motion between the two plates
2. The balls will bounce back to the bottom plate carrying the same charge they went up with
3. The balls will stick to the top plate and remain there
4. The balls will bounce back to the bottom plate carrying the opposite charge they went up with

Correct answer: The balls will bounce back to the bottom plate carrying the opposite charge they went up with

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