A particle is at rest in an electric field. The electric field is the only force acting on the particle. For which situation is the electric field strength $5.0 \times 10^{5}\,\text{V m}^{-1}$?
- Aa force of $1.6 \times 10^{-14}\,\text{N}$ acting on an electron
- Ba force of $3.2 \times 10^{-14}\,\text{N}$ acting on an alpha-particle
- Ca force of $8.0 \times 10^{-14}\,\text{N}$ acting on an alpha-particle
- Da force of $8.0 \times 10^{-14}\,\text{N}$ acting on a proton