The Zirconium Nucleus Contains 40 Protons,and an Electron Is 1

Multiple Choice

The zirconium nucleus contains 40 protons,and an electron is 1.0 nm from the nucleus.What is the electric force exerted on the electron by the nucleus? ( e = 1.60 × 10^-19 C,k = 1/4πε₀ = 9.0 × 10⁹ N ∙ m²/C²)

A) 2.9 nN
B) 1000 C
C) 3.7 nN
D) 6.8 nN
E) 9.2 nN