Question

Protons carry an electric charge ofe = 1.60×10^−19 C, electrons carry a charge of−e, andneutrons are electrically neutral. Protonsand neutrons have a massof 1.67×10^−27 kg, and electrons have amass of9.11×10^−31 kg. A uniformelectricfield can exert a force on a charged particle thateffectivelyneutralizes the force of gravity on the particle,causing it to be"weightless." What is the strength of the electricfield that willlevitate (a) a proton? (b) an electron? (c) analpha particle (twoprotons and two neutrons)?