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Physics 30 Chapter 10 / 16 Show all your work for the followmg questions. Make sure to show all the formulas used and have proper significant digits to receive-full marks. 1. Explain what happens when you rub copper With wool. [2) 2. Determine the number of electrons in 0.65 C. {1) 3. Briefly describe the three different ways to charge objects. 13] 4. A sphere with a charge of 2.2 ml: is 2'3. 7 cm apartfrom a different sphere With a charge of 4.75 mC. [al a. Calculate the electrostatic forte between the two objects. b. If you touch them together and place them the same distance apart, determine the new electrostatic force between them. 5. If three spheres are in line like the picture below, with sphere A having a charge of 2. 5 C, Sphere B having a Charge of l. 5 C, and sphere C having a charge of 7 4. 5 C. Sphere A and B are 15cm apart and sphere B and C are 20 cm apart. Determine the electrostatic force acting on sphere A. (5| (Note: these are all in a straight line] (3) (9 6. If three spheres are in line like the picture below, with sphere A having a charge of 2. 5 C, Sphere B having a Charge oi1.5 C, and sphere C having a charge of 7 4. S C. Sphere A and B are 15 m , apart and sphere B and C are 20 m apart. Determine the electrostatic force acting on sphere A. (6) (Note the angle between ABC is 90 degrees) 14) (/9