I. Problem Solving: Read each problem carefully, show your solution and box your final answer. Create a simple illustration to show the problem. (8 pts each)

1. You comb your hair with a hard rubber comb. What charged will be acquired by the hair and the rubber comb? 2. How do you know if the material is a conductor/insulator?

3. "Describe experiments to show electrostatic charging by induction." Consider a neutral metal sphere, indicate the step-by-step process of charging by induction using a negative charged

object.

4. The force between two identical charges separated by 1 centimeter is equal to 90 N. What is the magnitude of the two charges?

5. Four-point charges with two positive charges, q1 and q2 = 2.8 x10-6C and two negative charges, q3 and q4 = -2.8 x10-6C. They are situated at the corners of the square by 1 meter on each side. Calculate the electric force acting on point 1 exerted by the charges on point 2, 3, and 4.