Carbon nanotubes have an elastic modulus of 1.1 TPa (1 TPa = 1012 Pa). Assume that the carbon nanotube is only deformed elastically (not plastically) under the load of 4 µN. The carbon nanotube has a length of 10 µm (1 µm = 10-6 m). What is the tensile elongation (displacement) of the carbon nanotube in nanometres (1 nm = 10-9 m)?