A sodium ion (Na+\text{Na}^+Na+) and a calcium ion (Ca2+\text{Ca}^{2+}Ca2+) are trapped in a biological membrane channel, separated by a distance of 1.2 nm1.2\text{ nm}1.2 nm.
What is the magnitude of the electrostatic repulsive force between the two ions?
1.60×10−10 N1.60 \times 10^{-10}\text{ N}1.60×10−10 N
3.20×10−10 N3.20 \times 10^{-10}\text{ N}3.20×10−10 N
3.84×10−19 N3.84 \times 10^{-19}\text{ N}3.84×10−19 N
3.20×10−4 N3.20 \times 10^{-4}\text{ N}3.20×10−4 N
