Questions 19-24 with little work if needed

19) The diagram below shows two small metal spheres, A and B. Each sphere possesses a net charge of 4.0 x 10" coulomb. The spheres are separated by a distance of 1.0 meter. 4.0 x 10-6 C 4.0 x 10-6 C A 1.0 m B Which combination of charged spheres and separation distance produces an electrostatic force of the same magnitude as the electrostatic force between spheres A and B? A) 2.0 x 10-6 C 2.0 x 10-6 C 0.40 m 8.0 x 10-6 C 4.0 x 10-6 C B) 1.6 m 6.0 x 10-6C 4.0 x 10-6 C C 0.80 m 8.0 x 10-6 C 8.0 x 10-6 C D) 2.0 m 20) Identical charges A, B, and C are located between two oppositely charged parallel plates, as shown in the diagram below. + + +++++++++ A+ B+ C+ - - - - The magnitude of the force exerted on the charges by the electric field between the plates is A) the same for A, B, and C C) least on A and greatest on C B) the same on A and C, but less on B D) greatest on A and least on C 21) Which net charge could be found on an object? A) -1.8 x 10-18 C B) +3.2 x 10-18 C C) +2.4 x 10-19 C D) -0.80 x 10-19 C 22) What is the magnitude of the electrostatic force acting on an electron located in an electric field having a strength of 5.0 x 103 newtons per coulomb? A) 3.1 x 1022 N B) 5.0 x 103 N C) 8.0 x 10-16 N D) 3.2 x 10-23 N 23) If a 1.5-volt cell is to be completely recharged, each electron must be supplied with a minimum energy of A) 1.5 eV B) 9.5 x 1018 J C) 9.5 x 1018 ev D) 1.5 J 24) An alpha particle consists of two protons and two neutrons. The alpha particle's charge of +2 elementary charges is equivalent to A) 1.2x 1019 C B) 3.2x 10 19 C C) 3.2 x 1019 C D) 8.0 x 10-20 C