일반물리학 2 — Electric Fields: Problem 60

60 An alpha particle (the nucleus of a helium atom) has a mass of \( 6.64 \times 10^{-27} \text{ kg} \) and a charge of \( +2e \). What are the (a) magnitude and (b) direction of the electric field that will balance the gravitational force on the particle? (c) If the field magnitude is then doubled, what is the magnitude of the particle's acceleration?