what electric field strength would be required to suspend an alpha particle? (contains 2 protons and 2 neutrons) The answer should be 2.05 x 10^-7 N/C.

Question

I am not given distance so I am not sure how I should solve this particle problem.

Answer 1

gravity pulls down , the electric field pushes up

find the weight and charge of the α-particle

the field strength is Newtons per Coulomb
... the electric force equals the gravitational force

charge * field strength = m * g