What charge should be placed on the metal plate so that the oil drop remains at rest?

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You are preparing a Physics Magic Show as part of Engineering Day and your professor had a “great”
idea for a trick: The Levitating Oil Drop.
A fine dropper and triboelectric ionizer will regularly produce an oil drop with a mass of 5.3 × 10−12 kg
carrying fifty extra electrons. You set it up to produce the oil drops 15 mm below an oppositely charged
metal plate and at rest.
What charge should be placed on the metal plate so that the oil drop remains at rest?

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