An uncharged molecule of dna (deoxyribonucleic acid) is 2.14 µm long. the ends of the molecule become singly ionized so that there is a charge of −1.6 × 10−19 c on one end and +1.6 × 10−19 c on the other. the helical molecule acts like a spring and compresses 1.4% upon becoming charged. find the effective spring constant of the molecule. the value of coulomb’s constant is 8.98755 × 109 n · m2 /c 2 and the acceleration due to gravity is 9.8 m/s 2 . answer in units of n/m.