A charged particle A exerts a force of 2.62 N to the right on charged particle 8 when the particles are 13.7 mm apart. Particle B moves straight away from A to make the distance between them 18.9 mm. What vector force does it then exert on A? UN Direction + Need Help? Read It My Notes +Ask Your Teacher -/2 points SerPSET9 23.P.007. A molecule of DNA (deoxyribonucleic acid) is 2.07 um long. The ends of the molecule become singly ionized: negative on one end, positive on the other. The helical molecule acts like a spring and compresses 0.75% upon becoming charged. Determine the effective spring constant of the molecule. N/m Need Help? Read It My Notes +Ask Your Teacher -/2 points Nobel laureate Richard Feynman (1918-1988) once said that if two persons stood at arm's length from each other and each person had 1% more electrons than protons, the force of repulsion between them would be enough to lift a "weight" equal to that of the entire Earth. Carry out an order-of-magnitude calculation to substantiate this assertion. F~ 10 N SerPSET9 23.P.008.