21. Two charges separated a distance of 1.0 meter exert a 6.0-N force on each other. If the charges are pushed to a separation of 2.0 meter, the force on each charge will be a. 0.75 N. b. 1.5 N. c. 3.0 N. d. 6.0 N. e. 12.0 N. f. 24.0 N. 23. Exercise: The hydrogen atom consists of a single electron (mass 9.1 x 10 kg) and a proton (mass 1.7 x 10 kg) at an average separation distance of 53 x 10-m. Compare the electrical and gravitational force between the proton and the electron in a hydrogen atom. 24. Exercise: If a positive test charge is located between two charged spheres, A and B. Sphere A has a charge of +4q and is located 0.2 meter from the test charge. Sphere B has a charge of -2q and is located 0.1 meter from the test charge. If the magnitude of the force on the test charge due to sphere A is F, what is the magnitude of the force on the test charge due to sphere B? Test Charge