Solve question 1 and 4

Section 7.2 Questions Understanding Concepts 2. Two identical metal spheres, each with positive charge q, are 1. (a] Describe the electric force between two small charges separated by a centre-to-centre distance r. What effect will and compare this force to the gravitational force each of the following changes have on the magnitude of the between two small masses. How are the two forces different? electric force F exerted on each sphere by the other? (a) The distance between the two spheres is tripled. (b) State Coulomb's law and Newton's law of universal (b) The distance between the two spheres is halved. gravitation. In which respect are these two laws sim- (c) Both charges are doubled. ilar? How are they different? Organize your answer by (d) One of the charges becomes negative. copying and completing Figure 10. (e) One sphere is touched by an identical neutral sphere. which is then taken far away and the distance is Venn Diagram decreased to g Newton's Coulomb's 3. Two small spheres of charge +5.0 /C and -4.0 AC are law law separated by a distance of 2.0 m. Determine the magnitude of the force that each sphere exerts on the other. 4. Two 10.0-kg masses, each with a charge of + 1.0 C. are sep- arated by a distance of 0.500 km in interstellar space, far different common different from other masses and charges. (a) Calculate the force of gravity between the two objects. (b) Calculate the electric force between the two objects. (c) Draw FBDs showing all the forces acting on the objects. (d) Calculate the net force on each object, and use it to find the initial acceleration of each object Figure 10 (e) Repeat (c) ignoring the gravitational force. What have you found