A=29 B=39 C=139 D=12 3. What are the two methods you can use to charge given neutral conducting object? Explain the process of charging this object if positively charged object, neutral conducting object, insulating stand and conducting wire are given to you. (15 Points) 4. If a = B/10 mm, b = D/10 mm, Q1 = -B nC, Q2 = Cnc, and q = D nC in the figure, what is the magnitude of the electric force on q? (15points) b Q1 Q2 5. a. How many electrons are needed to form a charge of Q1 = -D nC? (5 Points) b. If you touch two charge balls of -D nC and B nC, what will be the net charge after touching them together? (5 Points) 6. If Q = B UC, q = D uC, and L = C cm in the figure, what is the magnitude and direction of the electrostatic force on q? (1 JC =1 x 106 C) (20 Points) +Q 7. The figure shows four situations in which four charged particles are evenly spaced to the left and right of a central point. The charge values are indicated. Which one has the greatest magnitude of the net electric force at the central point? what will be the direction of net force? (10 Points) (A) -0- (B) (C) (D te te te