1. Two charges exert a force upon each other. What happens to the force between them when (a) the distance between them is halved? (b) the charge on one of them is tripled? 2. What is the force between a positive charge of 0.00060 C and a negative charge of 0.00030 C separated by a distance of 0.30 m? 3. A hydrogen atom is composed of a proton and an electron at a distance of 5.3 x 10 m from each other. Compute the force pulling the proton and the electron together. Note: the charges can be found in the reference table. 4. A positive charge of 4.0 x 10 * C exerts a force of repulsion of 7.2 N on a second charge 0.050 m away. What is the sign and magnitude of the second charge? 5. In the diagram below, a positive test charge is located between two charged spheres, A and B. Sphere A has a charge of +2q 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. A Test charge B +2g -2q 0.2 m 0.1 m 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