Two metal pieces having a potential difference of 800 V are 0.02 m apart horizontally. A particle of mass 1.96 × 10'15 kg is suspended in equilibrium between the plates. If e is the elementary charge, then charge on the particle is

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Two metal pieces having a potential difference of 800 V are 0.02 m apart horizontally. A particle of mass 1.96 × 10'15 kg is suspended in equilibrium between the plates. If e is the elementary charge, then charge on the particle is