A Helium Nucleus Is Located Between the Plates of a Parallel-Plate

Multiple Choice

A helium nucleus is located between the plates of a parallel-plate capacitor as shown.The nucleus has a charge of +2e and a mass of 6.6 × 10^-27 kg.What is the magnitude of the electric field such that the electric force exactly balances the weight of the helium nucleus so that it remains stationary?

A) 4.0 × 10^-7 N/C
B) 6.6 × 10^-26 N/C
C) 2.0 × 10^-7 N/C
D) 5.0 × 10^-3 N/C
E) 1.4 × 10^-8 N/C