The centres of a proton and an alpha particle are separated by 4 mm.
What is the electrostatic force between them?
1.15×10−25 N1.15 \times 10^{-25}\text{ N}1.15×10−25 N
1.44×10−23 N1.44 \times 10^{-23}\text{ N}1.44×10−23 N
2.88×10−23 N2.88 \times 10^{-23}\text{ N}2.88×10−23 N
2.88×10−29 N2.88 \times 10^{-29}\text{ N}2.88×10−29 N
