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How strong an electric field is required to support an alpha particle (a 2-charged helium nucleus with two protons and two neutrons) against the force

How strong an electric field is required to support an alpha particle (a 2-charged helium nucleus with two protons and two neutrons) against the force of gravity? (proton =neutron = 1.67x 10^27 kg)

b) If the alpha particle is suspended between a set of parallel plates 3.0 cm apart, what potential must be provided across the plates?

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