Question

Protons carry an electric charge of e =1.60×10^−19 C,electrons carry a charge of −e,andneutrons are electrically neutral. Protons and neutrons have amassof 1.67×10^−27 kg,and electrons have a mass of9.11×10^−31 kg. Auniform electric field can exert a forceon a charged particlethat effectively neutralizes the force ofgravity on theparticle, causing it to be "weightless." What is thestrengthof the electric field that will levitate (a) a proton? (b)anelectron? (c) an alpha particle (two protons andtwoneutrons)?