Quiz 1

• An originally neutral electroscope is grounded briefly while a positively charged glass

  rod is held near it. After the glass rod is removed, the electroscope

  is negatively charged
• Point charge A is 2 mC, and point charge B is 10 mC, distance between them is 1.0 m.

  The third charge C, of -5 mC is positioned between A and B so that electric force acting

  on is zero. We move charge C a little bit along the line connecting charges A and B. The

  force acting on charge C after we moved it is directed

  in the same direction as displacement of C
• We have three identical metallic spheres A, B, C. Initially sphere A is charged with

  charge Q, meanwhile B and C are neutral. Sphere A is brought into contact with sphere

  B, then disconnected. After this sphere A is brought into contact with sphere C and

  disconnected again. Finally sphere A is brought into contact with sphere B again and

  disconnected. What is final charge of sphere A?

  3Q/8
• Small positive charge q is released near the big charge Q, which is fixed at some position. What statement is true for the motion of charge q?

  It moves away with decreasing acceleration
• Two charges, +Q and -Q are separated by distance d and then releases. Positive charge has mass, negative charge mass 2m. What statement is true?

  They move with increasing acceleration, but acceleration of negative one is half the acceleration of the positive one.